GWRS


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:SharesOutstanding
us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesIssued

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:MajorCustomers, us-gaap:ProductOrService
us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

us-gaap:Revenues

us-gaap:UnregulatedOperatingRevenue

us-gaap:OperatingExpenses

us-gaap:GeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss

us-gaap:InterestExpense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic

us-gaap:NonoperatingIncomeExpense

us-gaap:IncomeTaxExpenseBenefit

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent
us-gaap:BusinessAcquisition

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:BusinessAcquisition
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:BusinessAcquisition

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:BusinessAcquisition

us-gaap:Goodwill
us-gaap:BusinessAcquisition

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongTermDebtCurrent
us-gaap:LongtermDebtType

us-gaap:AccountsPayableCurrent
us-gaap:BusinessAcquisition

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:DividendsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent
us-gaap:BusinessAcquisition

us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebt

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:TreasuryStockValue
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock
us-gaap:SubsidiarySaleOfStock

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:DeferredIncomeTaxExpenseBenefit
us-gaap:AwardType
us-gaap:ShareBasedCompensation
us-gaap:AwardType, us-gaap:PlanName
us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:PaymentsOfDividends
us-gaap:StatementEquityComponents
us-gaap:Dividends
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:AwardType, us-gaap:PlanName
us-gaap:PlanName
us-gaap:AwardDate, us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
us-gaap:AwardType
us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

gwrs:EmployeeMedicalClaimsPaid
us-gaap:BusinessAcquisition
gwrs:GrowthPremiumsReceived

gwrs:OtherNonOperatingIncomeExpenseRelatedParty

gwrs:RegulatedOperatingRevenueWasteWaterAndRecycledWaterServices
us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType
gwrs:ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestWeightedAverageExercisePrice
gwrs:Responsibleparty
gwrs:TaxExpenseonContributions

gwrs:UtilitiesOperatingExpenseMaintenanceAndOperationsRelatedParty

us-gaap:AdjustmentsToAdditionalPaidInCapitalDividendsInExcessOfRetainedEarnings
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock

us-gaap:AmortizationOfFinancingCostsAndDiscounts
us-gaap:SubsequentEventType
us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:Dividends, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentDecreaseForgiveness

us-gaap:DeferredCompensationArrangementWithIndividualCompensationExpense

us-gaap:Depreciation

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherCurrentAssets

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets

us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities
us-gaap:PlanName
us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestPaid

us-gaap:InvestmentIncomeInterest
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
us-gaap:OperatingLeasesRentExpenseNet

us-gaap:OtherNonoperatingGainsLosses

us-gaap:PaymentsForLoans

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsOfStockIssuanceCosts
us-gaap:BusinessAcquisition
us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:ProceedsFromAdvancesForConstruction

us-gaap:ProceedsFromIssuanceOrSaleOfEquity

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount

us-gaap:RegulatedOperatingRevenueWater
us-gaap:ProductOrService, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty

us-gaap:RepaymentsOfAdvancesForConstruction

us-gaap:RepaymentsOfDebtAndCapitalLeaseObligations

us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
us-gaap:SubsidiarySaleOfStock
us-gaap:AwardDate, us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
us-gaap:AwardType
us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations

dei:EntityCommonStockSharesOutstanding

gwrs:AdvancesInAidOfConstruction

gwrs:CollectiveRevenueRequirementPhaseInYearFive

gwrs:CollectiveRevenueRequirementPhaseInYearFour

gwrs:CollectiveRevenueRequirementPhaseInYearOne

gwrs:CollectiveRevenueRequirementPhaseInYearSeven

gwrs:CollectiveRevenueRequirementPhaseInYearSix

gwrs:CollectiveRevenueRequirementPhaseInYearThree

gwrs:CollectiveRevenueRequirementPhaseInYearTwo

gwrs:CumulativeRevenueRequirementIncreaseInFifthYear

gwrs:CumulativeRevenueRequirementIncreaseInFirstYear

gwrs:CumulativeRevenueRequirementIncreaseInFourthYear

gwrs:CumulativeRevenueRequirementIncreaseInSecondYear

gwrs:CumulativeRevenueRequirementIncreaseInSeventhYear

gwrs:CumulativeRevenueRequirementIncreaseInSixthYear

gwrs:CumulativeRevenueRequirementIncreaseInThirdYear

gwrs:CustomerAndMeterDeposits
us-gaap:BusinessAcquisition
us-gaap:AwardType
gwrs:DefinedBenefitPlanExpectedFutureBenefitPayments
us-gaap:BusinessAcquisition
gwrs:GrowthPremiumReceivableForEachNewWaterMeterInstalled
us-gaap:BusinessAcquisition
gwrs:MaximumPayoutOfGrowthPremiumReceivable
us-gaap:AwardType, us-gaap:PlanName
gwrs:SharesExercised
gwrs:Utility, us-gaap:Range, us-gaap:RegulatoryLiability
gwrs:TaxReformRevenueReduction
gwrs:Utility, us-gaap:RegulatoryLiability
us-gaap:RegulatoryLiability
us-gaap:RegulatoryLiability, us-gaap:SubsequentEventType

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccruedBonusesCurrent

us-gaap:AccruedFeesAndOtherRevenueReceivable
us-gaap:BusinessAcquisition
us-gaap:AccruedLiabilitiesCurrentAndNoncurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AssetRetirementObligationCurrent
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AssetsFairValueDisclosure

us-gaap:BusinessCombinationContingentConsiderationLiability
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet

us-gaap:CapitalLeaseObligationsCurrent

us-gaap:CapitalLeaseObligationsNoncurrent

us-gaap:CapitalLeasesFutureMinimumPaymentsDue

us-gaap:CapitalLeasesFutureMinimumPaymentsDueCurrent

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInFourYears

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInThreeYears

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInTwoYears

us-gaap:CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments

us-gaap:CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
us-gaap:FairValueByAssetClass
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

us-gaap:ContractWithCustomerAssetNet
us-gaap:ProductOrService

us-gaap:ContractWithCustomerLiability
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:ContributionsInAidOfConstruction
us-gaap:BusinessAcquisition
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentCarryingAmount
us-gaap:LongtermDebtType

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet
us-gaap:LongtermDebtType

us-gaap:DeferredCompensationLiabilityCurrent
us-gaap:LongtermDebtType
us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredRevenue

us-gaap:DeferredRevenueNoncurrent
us-gaap:AwardType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:AwardType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:AwardType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:AwardType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:AwardType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestments

us-gaap:FairValueNetAssetLiability
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:InterestPayableCurrent
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:SubsequentEventType

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtFairValue
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:NontradeReceivablesCurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent
us-gaap:BusinessAcquisition
us-gaap:PrepaidExpenseCurrentAndNoncurrent

us-gaap:RegulatoryAssets
us-gaap:RegulatoryLiability
us-gaap:RegulatoryLiabilities

us-gaap:RegulatoryLiabilityNoncurrent
us-gaap:PublicUtilitiesRegulatoryProceeding

us-gaap:RelatedPartyTransactionDueFromToRelatedParty
us-gaap:FairValueByAssetClass
us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent
us-gaap:Range, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RoyaltyGuaranteesCommitmentsAmount
us-gaap:AwardDate, us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
us-gaap:BusinessAcquisition
us-gaap:TaxesPayableCurrentAndNoncurrent

us-gaap:TreasuryStockShares

Tables

  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:CommonStockValue ▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▆█▆▁▁0.2270.2270.2260.2160.2160.2160.2150.2150.2150.1970.1960.1960.1960.1960.1960.1960.2830.1960.0020.002NANANA
us-gaap:SharesOutstanding NA0.0990390.0990390.099039NANA0.0591740.059174NANA0.0NANANANANANANANANANANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStockNA22.68558322.6364221.6364221.6344721.6344721.5304721.5304721.5304719.75626619.63126619.63126619.63126619.60626619.58126619.58126619.58126619.581266NA18.241746NA18.312123NA
us-gaap:CommonStockSharesIssued NA22.68558322.6364221.6364221.6344721.6344721.5304721.5304721.5304719.75626619.63126619.63126619.63126619.60626619.58126619.58126628.30801319.58126618.24174618.241746NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▆▁22.63313322.56601422.39193NA21.5712421.52604321.493436NA21.1178119.68307219.669994NA19.66714119.64644819.622751NA19.61060419.17230618.241746NA18.2870818.31968718.329456
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▇▁22.58658822.56601422.333425NA21.53683421.52046121.471296NA21.08845619.64029519.631266NA19.61795119.58978219.581266NA19.58126619.17230618.241746NA18.2870818.31968718.329456
us-gaap:EarningsPerShareBasic ▂▂▂▂▂▂▂▂▂▃▂▃▂▂▂▂▂▁▂▂█▂▂0.05-0.010.02-0.019999999999999990.050.040.030.00.030.110.020.140.060.020.00.00.06-0.19-0.020.01.20.02-0.05
us-gaap:EarningsPerShareDiluted ▂▂▂▂▂▂▂▂▂▃▂▃▂▂▂▂▂▁▂▂█▂▂0.05-0.010.02-0.0099999999999999950.050.040.030.00.030.110.020.140.060.020.00.00.06-0.19-0.020.01.20.02-0.05
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
 TTM Greenblatt ROC _ _▅▃▃▁▅▄▂▃▄█▂▃▅▃▁▁▅▁▂▂2.8921.7271.7970.9552.5622.2451.1991.7452.0564.1041.3641.7212.811.7120.8790.7182.6650.8261.0611.416NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▆▃▄▆▅▃▄▅█▂▃▄▃▁▂▃▂▁▂▃▅▂10.7579.8898.238.6859.9429.1217.7238.2538.99910.8387.4267.88.4728.1456.7917.2148.187.5896.8167.1098.1439.0827.622
us-gaap:Revenues █▆▃▄▆▅▃▄▅█▂▃▄▃▁▂▃▂▁▂▃▅▂10.7579.8898.238.6859.9429.1217.7238.2538.99910.8387.4257.88.4728.1456.7917.2148.187.5896.8167.1098.1439.0827.622
us-gaap:UnregulatedOperatingRevenue ▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁▁▁▁▁▁▁▁0.0270.0880.0190.0160.0170.0160.0160.0810.0192.4040.0130.0170.0230.0180.0180.0210.020.020.020.150.1640.1750.127
us-gaap:OperatingExpenses ▇█▃▇▆▅▄▄▅▄▂▂▁▃▂▃▁▄▂▁▃7.8658.1626.4337.737.386.8766.5246.5086.9436.7346.0616.0795.6626.4335.9126.2765.5156.6645.7555.6936.087NANA
us-gaap:GeneralAndAdministrativeExpense ▅█▂▆▆▄▃▃▅▅▃▃▂▅▃▅▂▆▂▂▂▁▂2.9693.6252.0883.1433.0742.652.3752.3892.9422.822.3972.3762.0122.8092.4322.8791.9633.0922.0542.0662.021.8072.064
us-gaap:OperatingIncomeLoss ▅▃▃▁▅▄▂▃▄█▂▃▅▃▁▁▅▁▂▂▄▄▁2.8921.7271.7970.9552.5622.2451.1991.7452.0564.1041.3641.7212.811.7120.8790.7182.6650.8261.0611.4162.0562.280.775
us-gaap:InterestExpense ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▂▂▂▂▂1.3421.3591.3381.3441.3411.3431.361.3621.3581.3041.2311.2361.2721.3051.3121.2711.3157.4581.8221.8032.3672.052.079
us-gaap:OtherNonoperatingIncomeExpense ▃▁▃▄▃▃█▃▃▄▅▅▅▅▅▅▅█▅▄▅▅▂0.07-0.480.0490.0910.0680.0821.0680.0330.0820.1540.3230.3510.4390.3360.3520.3560.4361.1070.3230.2030.4020.338-0.176
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▇▅▆▅▇▆▆▆▆█▆▆▇▆▆▆▇▁▅1.629-0.0850.56-0.1741.4351.10.9910.5480.8543.0220.4610.91.9690.7160.1370.1142.085-5.463-0.536NANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic █▁▄1.6-0.10.6NA1.41.11.0NANANANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▂█▂▂-1.263-1.812-1.237-1.129-1.127-1.111-0.208-1.197-1.202-1.082-0.903-0.815-0.841-0.996-0.742-0.824-0.802-6.388-1.597-1.7241.082-1.685-2.218
us-gaap:IncomeTaxExpenseBenefit ▁▂▂▂▂▂▂▂▂▂▂▁▂▂▂▂▂▁▂▂█▂▁-0.498-0.037-0.2060.0760.3880.3560.3420.6540.2210.7660.141-0.8760.7660.2910.0870.0660.717-1.968-0.222-0.27421.2330.192-0.528
us-gaap:NetIncomeLoss ▂▂▂▂▂▂▂▂▂▃▂▃▂▂▂▂▂▁▂▂█▂▂1.131-0.1220.354-0.251.0470.7780.649-0.1060.6332.2560.322.7341.2030.4250.05-0.091.146-3.594-0.314-0.0321.9050.403-0.915
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:Assets █▇▇▆▆▅▅▅▄▁▂▁▁▁▂▁▂▁▁▁280.94275.483276.734266.113266.45264.386262.483262.461254.209238.639239.394238.568238.171237.777240.045238.819241.112238.398237.217235.742NANANA
us-gaap:Liabilities █▇▇▇▆▆▅▅▃▃▃▃▃▃▃▃▃▃▂▁247.123241.438241.7241.441240.088237.623235.435234.59224.767223.051225.507223.708224.786224.513225.808223.628225.225222.607219.253215.679NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇▇▆▆▅▅▅▄▁▂▁▁▁▂▁▂▁▁▁280.94275.483276.734266.113266.45264.386262.483262.461254.209238.639239.394238.568238.171237.777240.045238.819241.112238.398237.217235.742NANANA
us-gaap:StockholdersEquity ███▅▅▅▅▆▆▂▁▂▁▁▁▂▂▂▃▃33.81734.04535.03424.67226.36226.76327.04827.87129.44215.58813.88714.8613.38513.26414.23715.19115.88715.79117.96420.063NA24.31225.445
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:AssetsCurrent ▆▅▅▂▃▃▄▄▆▁▂▁▂▃▄▆██▄▄24.10421.30421.96612.29316.30216.51417.8117.33425.4728.79111.2159.66512.7214.34719.00624.7431.12930.13319.53318.715NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▅▅▅▂▃▃▄▄▆▁▂▂▂▃▄▆██▃▃▅▁▁18.06215.47717.1377.51311.09111.28513.30312.75620.1733.7786.9155.2487.8389.12514.80720.49826.28225.58111.41811.51316.7673.5644.707
us-gaap:AccountsReceivableNetCurrent ██▅▄▅▄▂▃▅▅▃▄▄▅▂▃▄▄▁▁2.1462.1251.7011.6311.781.6241.3351.4881.7761.7051.3541.5281.5881.6791.3281.4711.5091.5381.1951.132NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▃▂▂▁▁▂▂▁▃▂▁▂▃▄▂▂▄▂█▄1.0290.7570.7470.6750.5890.7620.7820.6861.0230.7690.6840.70.9141.2010.7960.8191.1320.882.0481.179NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:PropertyPlantAndEquipmentGross ███▇▇▆▆▆▄▄▄▄▄▃▃▂▂▁▁▁334.769330.041329.331326.303321.027317.635313.857312.148288.363287.564287.16289.051285.623282.084281.428273.366267.692262.023260.66258.244NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██▇▇▆▆▆▅▄▃▃▃▃▃▃▃▂▂▁▁98.35196.1594.95692.74990.7688.67787.15285.09376.67874.8374.39475.59273.78672.18674.07972.87771.36767.26265.64364.092NANANA
us-gaap:AmortizationOfIntangibleAssets 0.6NANA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:PropertyPlantAndEquipmentNet ████▇▇▆▆▄▄▄▄▄▄▃▂▁▁▁▁236.418233.891234.375233.554230.267228.958226.705227.055211.685212.734212.766213.459211.837209.898207.349200.489196.325194.761195.017194.152NANANA
us-gaap:Goodwill █████▅▁▁4.3984.3984.3984.3984.3983.5592.6422.639NANANA0.0NANANA0.0NANA0.00.0NANANA
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill ████████▁▁▁▁▁▁▁▁▁▁▁▁1.7411.7411.7411.7411.7411.7411.7451.7451.5451.5451.5451.5451.5451.5451.5451.5451.5451.5451.5451.545NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▄▆▆▆███▇▇▇▇▇▇▇▇▇▇▇▇11.72612.28212.55412.55412.55412.96812.97212.97212.77212.77212.77212.77212.77212.77212.77212.77212.77212.77212.77212.772NANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▁▄▆▆▆███████████████9.98510.54110.81310.81310.81311.22711.22711.22711.22711.22711.22711.22711.22711.22711.22711.22711.22711.22711.22711.227NANANA
us-gaap:OtherAssetsNoncurrent ▆▆▆▆▆▅▄▄▄▄▂▂▁▁▁▁▁▁██20.41820.28820.39320.26619.88118.91417.96818.07217.05217.11415.41315.44413.61413.53213.6913.5913.65813.50422.66722.875NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:LiabilitiesCurrent ▃▂▂▃▄▂▃▂▄▂▄▁▃▃▇▄▇▂█▄10.4519.3859.7410.110.9699.5279.9389.57611.0979.41810.8188.97610.47910.18512.92210.90112.3989.74813.31110.663NANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument,us-gaap:LongtermDebtType gwrs:A2017WIFALoan,gwrs:NotesAndBondsPayableNA0.00.00.0010.0010.0010.0010.0010.001NANA0.0NANANANANANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument,us-gaap:LongtermDebtType gwrs:HarquahalaLoan,gwrs:NotesAndBondsPayable▁▆█▄▄▃▃▃▃▃▃▃▃▄0.0040.0070.0080.0060.0060.0050.0050.0050.0050.0050.0050.0050.0050.006NA0.0NANANANANANANA
 us-gaap:LongTermDebtCurrent us-gaap:LongtermDebtType gwrs:NotesAndBondsPayable▁▅▇▅▅▄▄██▇▇▇▇█0.0040.0070.0080.0070.0070.0060.0060.0090.0090.0080.0080.0080.0080.009NA0.0NANANA1.885NANANA
us-gaap:AccountsPayableCurrent ▁▃▂▃▂▂▁▂▁▂▄▁▁▃█▅▇▃▇▄0.1950.8620.6740.9920.7260.7150.3160.6040.3660.5231.5760.3210.2410.8453.0391.7912.6531.0012.451.322NANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▁▅▇█▁▁▂▄▂▁▁▂▅▂▂▅▅▂██1.8362.3432.6832.7521.8811.8311.9922.1922.0261.8661.8492.0162.3321.9531.9712.3982.3831.9382.7582.704NANANA
us-gaap:DividendsPayableCurrent ███▆▆▆▆▆▅▂▂▂▃▃▂▂▁▄0.5440.5440.5430.5190.5140.5140.5120.5120.5070.4660.4640.4640.470.470.4580.4580.4480.487NA0.452NANANA
us-gaap:AccruedLiabilitiesCurrent ▇▄▅▅▇▅▆▅█▅▆▅▇▆▇▅▆▄▄▁8.6156.8847.4037.5468.6897.38.0837.4659.2697.4827.8327.2528.8277.9038.4627.6028.1016.9616.6995.137NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:LiabilitiesNoncurrent █▇▇▇▆▆▆▅▃▃▃▃▃▃▃▃▃▃▁▁236.672232.053231.96231.341229.119228.096225.497225.014213.67213.633214.689214.732214.307214.328212.886212.727212.827212.859205.942205.016NANANA
us-gaap:LongTermDebt ▁▂▂█115.004115.007115.008115.025NANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations ██████████████████▁▁114.594114.612114.629114.664114.593114.582114.594114.507114.509114.472114.444114.363114.355114.349114.28114.317114.464114.486102.553102.417NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ███▇█▇▇▆▆▅▄▄▅▃▂▂▂▁5.2145.1015.134.9195.014.8574.5974.354.1623.9663.2283.1143.7192.9812.442.3832.4261.861NA4.164NANANA
us-gaap:OtherLiabilitiesNoncurrent █▆▆▅▅▃▂▂▂▂▂▃▃▃▃▃▃▃▁▁2.6572.0931.8761.6691.5160.8090.680.660.7190.6150.5790.9621.0051.0430.8960.9130.8260.9040.2860.252NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:StockholdersEquity ███▅▅▅▅▆▆▂▁▂▁▁▁▂▂▂▃▃33.81734.04535.03424.67226.36226.76327.04827.87129.44215.58813.88714.8613.38513.26414.23715.19115.88715.79117.96420.063NA24.31225.445
us-gaap:CommonStockValue ▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▆█▆▁▁0.2270.2270.2260.2160.2160.2160.2150.2150.2150.1970.1960.1960.1960.1960.1960.1960.2830.1960.0020.002NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ███▅▅▅▆▆▅▁▁▂▂▂▃▃▃▄▃▄33.59133.81934.80924.45726.14726.54826.83427.65725.64312.43912.99514.28815.54716.62918.50619.5120.11621.07919.93821.659NANANA
us-gaap:RetainedEarningsAccumulatedDeficit NA0.00.00.00.00.00.00.03.5852.9520.6960.376-2.358-3.561-4.465-4.515-4.425-5.571-1.976-1.598NANANA
us-gaap:TreasuryStockValue ███▁███▁▁▄0.0010.0010.001-0.0010.0010.0010.001-0.001-0.0010.0NA0.0NANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents us-gaap:CommonStockNA0.0010.01NANANANANANANANANANANANA0.00.087NANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents,us-gaap:SubsidiarySaleOfStock us-gaap:AdditionalPaidInCapital,us-gaap:CommonStockNA-0.00311.511NANANANANA14.619NANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:SubsidiarySaleOfStock us-gaap:CommonStockNA-0.00211.521NANANANANA14.636NANANANANANANANANANANANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▅▆▄▇▅▆▅▇▅▆▆▇▅▅▄▇▁▅▃▇▄▄6.5961.9313.170.3895.4631.933.7841.1314.8771.3123.9872.8764.6021.5792.099-0.2734.633-4.9012.436-0.9944.477-0.0020.764
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▂▁▂▂▁▂▁▂▁▂▁▁▁▁▁▂▂▂▂█▂▂-2.092-1.873-3.534-2.274-2.926-3.058-1.798-7.3-0.964-3.962-1.099-4.184-4.04-6.262-6.512-4.04-1.8351.088-1.38-0.75753.7890.282-1.342
us-gaap:NetCashProvidedByUsedInFinancingActivities ▆▆▇▆▆▆▆▆▇▆▆▆▆▆▆▆▆█▆▆▁▆▆-1.527-1.51810.129-1.157-2.167-0.85-1.438-1.24812.482-0.487-1.221-1.282-1.849-0.999-1.278-1.471-2.09717.976-1.151-3.503-45.063-1.423-1.292
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▅▆▄▇▅▆▅▇▅▆▆▇▅▅▄▇▁▅▃▇▄▄6.5961.9313.170.3895.4631.933.7841.1314.8771.3123.9872.8764.6021.5792.099-0.2734.633-4.9012.436-0.9944.477-0.0020.764
us-gaap:NetIncomeLoss ▂▂▂▂▂▂▂▂▂▃▂▃▂▂▂▂▂▁▂▂█▂▂1.131-0.1220.354-0.251.0470.7780.649-0.1060.6332.2560.322.7341.2030.4250.05-0.091.146-3.594-0.314-0.0321.9050.403-0.915
us-gaap:IncreaseDecreaseInAccountsReceivable ▅█▅▃▆▇▃▁▅▆▃▄▄▇▃▄▄▇▅▃▂█▃0.0780.4260.111-0.1330.1720.3-0.146-0.3730.1420.202-0.149-0.018-0.0590.378-0.122-0.013-0.0420.3790.085-0.153-0.2620.451-0.161
us-gaap:DeferredIncomeTaxExpenseBenefit ▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂▂▂▁▁▂█▂▁0.114-0.0290.21-0.090.1530.260.2470.1870.1970.7380.114-0.6050.7380.3390.0570.1280.564-1.963-0.339-0.30421.2010.192-0.528
 us-gaap:ShareBasedCompensation us-gaap:AwardType gwrs:PhantomShareUnitsAndStockAppreciationRights▃▃▅▅▆▄▃▃▆▅▁▃▃▆▃▆▂█▃▄▂▃▃0.20.20.50.40.60.30.1030.1650.6940.45-0.20.1380.0970.6890.1760.60.0280.9850.1880.2650.050.2170.163
 us-gaap:ShareBasedCompensation us-gaap:AwardType,us-gaap:PlanName us-gaap:EmployeeStockOption,gwrs:TwentyNineteenStockOptionGrantMember▄▄▄0.0490.0490.049NA0.0260.00.0NA0.0NANANANANANANANANANANANANANA
 us-gaap:ShareBasedCompensation us-gaap:AwardType,us-gaap:PlanName us-gaap:EmployeeStockOption,gwrs:TwentySeventeenStockOptionGrant▁▁▁█▁▁▁0.0670.0670.0670.1020.0670.0660.065NA0.0670.0670.0540.0790.044NANANANANANANANANANA
 us-gaap:ShareBasedCompensation us-gaap:AwardType,us-gaap:PlanName us-gaap:EmployeeStockOption,gwrs:TwentySixteenStockOptionGrantNANA0.00.00.00.0NA0.00.00.0240.0430.0440.0430.0430.2650.5860.0430.0190.0NANANANA
 us-gaap:ShareBasedCompensation us-gaap:TitleOfIndividual,us-gaap:AwardDate,us-gaap:AwardType gwrs:MembersOfManagement,gwrs:Q22020,us-gaap:RestrictedStock▁█0.20.7NANANANANANANANANANANANANANANANANANANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▂▁▂▂▁▂▁▂▁▂▁▁▁▁▁▂▂▂▂█▂▂-2.092-1.873-3.534-2.274-2.926-3.058-1.798-7.3-0.964-3.962-1.099-4.184-4.04-6.262-6.512-4.04-1.8351.088-1.38-0.75753.7890.282-1.342
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▃▃▅▄▄▄▃▂▂▂▂▅▅██▅▃▂▂▂▂▁▁2.0911.8743.5253.4022.9273.061.7981.3830.9461.3571.1014.2833.8316.2666.5054.0751.8791.2631.3711.1781.1680.590.419
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▆▆▇▆▆▆▆▆▇▆▆▆▆▆▆▆▆█▆▆▁▆▆-1.527-1.51810.129-1.157-2.167-0.85-1.438-1.24812.482-0.487-1.221-1.282-1.849-0.999-1.278-1.471-2.09717.976-1.151-3.503-45.063-1.423-1.292
us-gaap:ProceedsFromIssuanceOfLongTermDebt NA0.00.00.0040.00.00.0310.1260.0140.00.00.00.0NANA0.00.0NANANANANANA
us-gaap:PaymentsOfDividends ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁▁1.6331.6341.6291.5451.5421.5411.5371.4831.5221.3951.3911.3871.3571.3331.3221.3021.3311.2431.161.08624.2281.1811.112
 us-gaap:Dividends us-gaap:StatementEquityComponents us-gaap:RetainedEarnings1.009NA0.354NA1.0470.7780.649NA1.4941.3950.696NANANANANANANANANANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType us-gaap:RevolvingCreditFacilityNANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType,us-gaap:SubsequentEventType us-gaap:RevolvingCreditFacility,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANA

None

us-gaap:CommonStockValue

us-gaap:CommonStockValue


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value227000.0227000.0226000.0216000.0216000.0216000.0215000.0215000.0215000.0197000.0196000.0196000.0196000.0196000.0196000.0196000.0283000.0196000.02000.02000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.0

None

us-gaap:SharesOutstanding

us-gaap:SharesOutstanding


None
Period End2020-06-302020-03-312019-12-312019-03-312018-12-312018-03-31
Value0.0990390.0990390.0990390.0591740.0591740.0
Percentage of SharesOutstanding100.0100.0100.0100.0100.00.0

us-gaap:SharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312013-12-31
Value222221212121212119191919191919191918181818
Percentage of SharesOutstanding22905.722856.121846.40.00.036385.036385.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value22222121212121211919191919191928191818
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value222222212121211919191919191918181818
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value222222212121211919191919191918181818
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.05-0.010.02-0.020.050.040.0300.030.110.020.140.060.02000.06-0.19-0.0201.20.02-0.05
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0

None

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.05-0.010.02-0.010.050.040.0300.030.110.020.140.060.02000.06-0.19-0.0201.20.02-0.05
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0

None

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value109.8898.238.6859.9429.1217.7238.2538.999107.4267.88.4728.1456.7917.2148.187.5896.8167.1098.1439.0827.622
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers, us-gaap:ProductOrService

gwrs:Commercial, gwrs:WaterServices


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.2240.2090.2080.2280.1950.160.2140.250.165
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.12.12.52.32.12.12.42.32.2
Percentage of Revenues2.12.12.52.32.12.12.42.32.2
Percentage of Revenues gwrs:Commercial gwrs:WaterServices0.00.00.00.00.00.00.00.00.0

gwrs:Constructionservices, gwrs:WaterServices


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.1690.1510.0680.0370.0370.030.0630.0810.056
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.50.80.40.40.40.70.70.8
Percentage of Revenues1.61.50.80.40.40.40.70.70.8
Percentage of Revenues gwrs:Constructionservices gwrs:WaterServices0.00.00.00.00.00.00.00.00.0

gwrs:Irrigation, gwrs:WaterServices


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value1.2970.910.3211.320.8430.2891.1110.843
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.19.23.913.39.23.712.37.8
Percentage of Revenues12.19.23.913.39.23.712.37.8
Percentage of Revenues gwrs:Irrigation gwrs:WaterServices0.00.00.00.00.00.00.00.0

gwrs:OtherWaterServices, gwrs:WaterServices


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.1790.1580.0970.2270.20.1270.1920.020.15
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.61.22.32.21.62.10.22.0
Percentage of Revenues1.71.61.22.32.21.62.10.22.0
Percentage of Revenues gwrs:OtherWaterServices gwrs:WaterServices0.00.00.00.00.00.00.00.00.0

gwrs:Residential, gwrs:WaterServices


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value3.6233.2472.6943.1512.9682.5322.9782.722
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.732.832.731.732.532.833.125.1
Percentage of Revenues33.732.832.731.732.532.833.125.1
Percentage of Revenues gwrs:Residential gwrs:WaterServices0.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

gwrs:Commercial, gwrs:Wastewaterandrecycledwater, us-gaap:RegulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.2440.2380.2390.2290.2270.2220.1990.2060.197
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.42.92.32.52.92.21.92.7
Percentage of Revenues2.32.42.92.32.52.92.21.92.7
Percentage of Revenues gwrs:Commercial gwrs:Wastewaterandrecycledwater us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.0

gwrs:Otherwastewater, gwrs:Otherwastewater, us-gaap:RegulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.0590.0470.060.1050.1020.0930.0920.292
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.50.71.11.11.21.02.7
Percentage of Revenues0.50.50.71.11.11.21.02.7
Percentage of Revenues gwrs:Otherwastewater gwrs:Otherwastewater us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.0

gwrs:Recycledwater, gwrs:Wastewaterandrecycledwater, us-gaap:RegulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.4190.3770.0940.3350.3030.080.2640.280.145
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.93.81.13.43.31.02.92.62.0
Percentage of Revenues3.93.81.13.43.31.02.92.62.0
Percentage of Revenues gwrs:Recycledwater gwrs:Wastewaterandrecycledwater us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.0

gwrs:Residential, gwrs:Wastewaterandrecycledwater, us-gaap:RegulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value4.5164.4644.434.2934.234.1743.8673.743.851
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.045.153.843.246.454.043.034.551.9
Percentage of Revenues42.045.153.843.246.454.043.034.551.9
Percentage of Revenues gwrs:Residential gwrs:Wastewaterandrecycledwater us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

gwrs:WaterServices


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.4924.6753.3884.9634.2433.1384.5583.9163.115
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax51.147.341.249.946.540.650.736.141.9
Percentage of Revenues51.147.341.249.946.540.650.736.142.0
Percentage of Revenues gwrs:WaterServices0.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

gwrs:OtherMiscellaneousrevenueMember, us-gaap:UnregulatedOperation


None
Period End2020-09-302019-09-302018-09-30
Value0.0010.0010.003
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.0
Percentage of Revenues0.00.00.0
Percentage of Revenues gwrs:OtherMiscellaneousrevenueMember us-gaap:UnregulatedOperation0.00.00.0

gwrs:RentRevenue, us-gaap:UnregulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0260.0880.0190.0160.0160.016
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.90.20.20.20.2
Percentage of Revenues0.20.90.20.20.20.2
Percentage of Revenues gwrs:RentRevenue us-gaap:UnregulatedOperation0.00.00.00.00.00.0

gwrs:Wastewaterandrecycledwater, us-gaap:RegulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.2385.1264.8234.9624.8624.5694.4224.5184.298
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.751.858.649.953.359.249.141.757.9
Percentage of Revenues48.751.858.649.953.359.249.141.757.9
Percentage of Revenues gwrs:Wastewaterandrecycledwater us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

us-gaap:RegulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value109.8018.2118.679.9259.1057.7078.1728.988.4347.413
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax99.799.199.899.899.899.899.899.099.877.899.8
Percentage of Revenues99.799.199.899.899.899.899.899.099.877.899.8
Percentage of Revenues us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnregulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0270.0880.0190.0150.0170.0160.0160.0810.0192.4040.013
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.90.20.20.20.20.21.00.222.20.2
Percentage of Revenues0.30.90.20.20.20.20.21.00.222.20.2
Percentage of Revenues us-gaap:UnregulatedOperation0.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:Revenues

us-gaap:Revenues


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value109.8898.238.6859.9429.1217.7238.2538.999107.4257.88.4728.1456.7917.2148.187.5896.8167.1098.1439.0827.622
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:UnregulatedOperatingRevenue

us-gaap:UnregulatedOperatingRevenue


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value27000.088000.019000.016000.017000.016000.016000.081000.019000.02404000.013000.017000.023000.018000.018000.021000.020000.020000.020000.0150000.0164000.0175000.0127000.0
Percentage of UnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.30.90.20.20.20.20.21.00.222.20.20.20.30.20.30.30.20.30.32.12.01.91.7

None

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value7.8658.1626.4337.737.386.8766.5246.5086.9436.7346.0616.0795.6626.4335.9126.2765.5156.6645.7555.6936.087
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues73.182.578.289.074.275.484.578.977.262.181.677.966.879.087.187.067.487.884.480.174.8

None

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.9693.6252.0883.1433.0742.652.3752.3892.9422.822.3972.3762.0122.8092.4322.8791.9633.0922.0542.0662.021.8072.064
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues27.636.725.436.230.929.130.828.932.726.032.330.523.734.535.839.924.040.730.129.124.819.927.1

None

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.8921.7271.7970.9552.5622.2451.1991.7452.0564.1041.3641.7212.811.7120.8790.7182.6650.8261.0611.4162.0562.280.775
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues26.917.521.811.025.824.615.521.122.837.918.422.133.221.012.910.032.610.915.619.925.225.110.2

None

us-gaap:InterestExpense

us-gaap:InterestExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.3421.3591.3381.3441.3411.3431.361.3621.3581.3041.2311.2361.2721.3051.3121.2711.3157.4581.8221.8032.3672.052.079
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues12.513.716.315.513.514.717.616.515.112.016.615.815.016.019.317.616.198.326.725.429.122.627.3

None

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value70000.0-480000.049000.091000.068000.082000.01068000.033000.082000.0154000.0323000.0351000.0439000.0336000.0352000.0356000.0436000.01107000.0323000.0203000.0402000.0338000.0-176000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.7-4.90.61.00.70.913.80.40.91.44.44.55.24.15.24.95.314.64.72.94.93.7-2.3

None

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.629-0.0850.56-0.1741.4351.10.9910.5480.8543.0220.4610.91.9690.7160.1370.1142.085-5.463-0.536
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues15.1-0.96.8-2.014.412.112.86.69.527.96.211.523.28.82.01.625.5-72.0-7.9

None

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1600000.0-100000.0600000.01400000.01100000.01000000.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic100.0100.0100.0100.0100.0100.0
Percentage of Revenues14.9-1.07.314.112.112.9

None

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-1.263-1.812-1.237-1.129-1.127-1.111-0.208-1.197-1.202-1.082-0.903-0.815-0.841-0.996-0.742-0.824-0.802-6.388-1.597-1.7241-1.685-2.218
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-11.7-18.3-15.0-13.0-11.3-12.2-2.7-14.5-13.4-10.0-12.2-10.4-9.9-12.2-10.9-11.4-9.8-84.2-23.4-24.2504.5-18.6-29.1

None

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-0.498-0.037-0.2060.0760.3880.3560.3420.6540.2210.7660.141-0.8760.7660.2910.0870.0660.717-1.968-0.222-0.274210.192-0.528
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-4.6-0.4-2.50.93.93.94.47.92.57.11.9-11.29.03.61.30.98.8-25.9-3.3-3.9260.82.1-6.9

None

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.131-0.1220.354-0.251.0470.7780.649-0.1060.6332.2560.322.7341.2030.4250.05-0.091.146-3.594-0.314-0.03210.403-0.915
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues10.5-1.24.3-2.910.58.58.4-1.37.020.84.335.114.25.20.7-1.214.0-47.4-4.6-0.4269.04.4-12.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-06-302015-03-31
Value1.131-0.1220.3541.0470.7780.649-0.1060.6332.2560.322.7341.2030.5640.05-0.091.146-3.594-0.3140.403-0.915
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0132.7100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues10.5-1.24.310.58.58.4-1.37.020.84.335.114.26.90.7-1.214.0-47.4-4.64.4-12.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:Assets

us-gaap:Assets


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value280275276266266264262262254238239238238237240238241238237235
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:Liabilities

us-gaap:Liabilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value247241241241240237235234224223225223224224225223225222219215
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets88.087.687.390.790.189.989.789.488.493.594.293.894.494.494.193.693.493.492.491.5

None

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value280275276266266264262262254238239238238237240238241238237235
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value3334352426262727291513141313141515151720242527-32.842
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.012.412.79.39.910.110.310.611.66.55.86.25.65.65.96.46.66.67.68.50.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value333334242626262725121214151618192021192147495055
Percentage of StockholdersEquity99.399.799.499.199.299.299.299.287.179.893.696.2116.2125.4130.0128.4126.6133.5111.0108.0196.5193.8182.9-167.6
Percentage of Assets12.012.312.69.29.810.010.210.510.15.25.46.06.57.07.78.28.38.88.49.20.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value0.2270.2270.2260.2160.2160.2160.2150.2150.2150.1970.1960.1960.1960.1960.1960.1960.2830.1960.0020.0020.0020.0020.0020.002
Percentage of StockholdersEquity0.70.70.60.90.80.80.80.80.71.31.41.31.51.51.41.31.81.20.00.00.00.00.0-0.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value-0.1220.00.00.00.00.00.03.5852.9520.6960.376-2.358-3.561-4.465-4.515-4.425-5.571-1.976-1.598-23.473-23.876-22.961-87.892
Percentage of StockholdersEquity-0.40.00.00.00.00.00.012.218.95.02.5-17.6-26.8-31.4-29.7-27.9-35.3-11.0-8.0-96.5-93.8-83.0267.6
Percentage of Assets-0.00.00.00.00.00.00.01.41.20.30.2-1.0-1.5-1.9-1.9-1.8-2.3-0.8-0.70.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302015-12-312015-06-302014-12-31
Value-0.001-0.001-0.001-0.001-0.001-0.001-0.001-0.001-0.0010.00.00.00.0-0.0870.0870.00.0020.0
Percentage of StockholdersEquity-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.0-0.50.60.00.00.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.0-0.00.00.00.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStockCommon


None
Period End2020-09-302019-12-312018-12-312018-09-30
Value-0.0010.0-0.001-0.001
Percentage of StockholdersEquity-0.00.0-0.0-0.0
Percentage of Assets-0.00.0-0.0-0.0
Percentage of Assets us-gaap:TreasuryStockCommon0.00.00.00.0

None

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value2421211216161717258.791119.6651214192431301918
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.67.77.94.66.16.26.86.610.03.74.74.15.36.07.910.412.912.68.27.9

None

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value1815177.51311111312203.7786.9155.2487.8389.125142026251111163.5644.7076.5771.96
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.45.66.22.84.24.35.14.97.91.62.92.23.33.86.28.610.910.74.84.90.00.00.00.00.0

None

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value2146000.02125000.01701000.01631000.01780000.01624000.01335000.01488000.01776000.01705000.01354000.01528000.01588000.01679000.01328000.01471000.01509000.01538000.01195000.01132000.0
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.80.60.60.70.60.50.60.70.70.60.60.70.70.60.60.60.60.50.5

us-gaap:AccountsReceivableNetCurrent us-gaap:BusinessAcquisition

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value111.0111.0111.0111000.0111.0111.0111000.0111000.0
Percentage of AccountsReceivableNetCurrent0.00.00.06.80.00.08.37.5
Percentage of Assets0.00.00.00.00.00.00.00.0
Percentage of Assets gwrs:RedRockUtilities0.00.00.00.00.00.00.00.0

None

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1029000.0757000.0747000.0675000.0589000.0762000.0782000.0686000.01023000.0769000.0684000.0700000.0914000.01201000.0796000.0819000.01132000.0880000.02048000.01179000.0
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.30.30.30.20.30.30.30.40.30.30.30.40.50.30.30.50.40.90.5

None

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value334330329326321317313312288287287289285282281273267262260258
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets119.2119.8119.0122.6120.5120.1119.6118.9113.4120.5120.0121.2119.9118.6117.2114.5111.0109.9109.9109.5

us-gaap:PropertyPlantAndEquipmentGross us-gaap:BusinessAcquisition

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.0007480.0007480.0007480.7480.0007480.0007480.7480.748
Percentage of PropertyPlantAndEquipmentGross0.00.00.00.20.00.00.20.2
Percentage of Assets0.00.00.00.30.00.00.30.3
Percentage of Assets gwrs:RedRockUtilities0.00.00.00.00.00.00.00.0

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

gwrs:ComputerAndOfficeEquipment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value0.9910.9820.8680.7850.7390.690.6690.6390.6030.6030.6030.720.6830.6280.681.0561.11.0691.0571.022
Percentage of PropertyPlantAndEquipmentGross0.30.30.30.20.20.20.20.20.20.20.20.20.20.20.20.40.40.40.40.4
Percentage of Assets0.40.40.30.30.30.30.30.20.20.30.30.30.30.30.30.40.50.40.40.4
Percentage of Assets gwrs:ComputerAndOfficeEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

gwrs:FurnitureFixtureAndLeaseholdImprovements


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1.651.6480.6230.6230.3710.3710.3710.3710.3710.3710.3710.3680.3680.3690.3650.3830.3860.3860.3910.386
Percentage of PropertyPlantAndEquipmentGross0.50.50.20.20.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.1
Percentage of Assets0.60.60.20.20.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets gwrs:FurnitureFixtureAndLeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

gwrs:LandAndLandRights


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1.1471.1471.0511.0511.0510.9310.8970.8970.8910.8910.8610.8610.8610.860.7640.7640.7520.7520.7520.752
Percentage of PropertyPlantAndEquipmentGross0.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.3
Percentage of Assets0.40.40.40.40.40.40.30.30.40.40.40.40.40.40.30.30.30.30.30.3
Percentage of Assets gwrs:LandAndLandRights0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

gwrs:MainsAndLinesAndSewers


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value142139138138134132131131119119117117116116116115115114114113
Percentage of PropertyPlantAndEquipmentGross42.742.242.042.342.041.742.042.241.441.540.940.640.941.441.242.443.243.643.843.9
Percentage of Assets50.950.650.051.950.650.250.350.247.050.049.049.249.149.148.348.547.948.048.248.1
Percentage of Assets gwrs:MainsAndLinesAndSewers0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

gwrs:Meters


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value14141414131313131313121212124.6454.6374.5724.2934.2684.253
Percentage of PropertyPlantAndEquipmentGross4.34.34.34.34.34.34.34.44.54.54.44.44.44.41.71.71.71.61.61.6
Percentage of Assets5.15.25.15.35.25.25.25.25.15.45.35.35.35.21.91.91.91.81.81.8
Percentage of Assets gwrs:Meters0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

gwrs:Plant


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value9595959486858181777671727273726767666664
Percentage of PropertyPlantAndEquipmentGross28.629.028.929.027.026.926.026.127.026.525.025.225.426.025.824.825.325.325.425.2
Percentage of Assets34.134.734.435.632.532.331.131.030.631.929.930.530.530.830.228.428.127.827.927.6
Percentage of Assets gwrs:Plant0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConstructionInProgress


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value3939424047474645444553535148565348454445
Percentage of PropertyPlantAndEquipmentGross11.912.012.912.414.815.114.714.515.416.018.518.518.017.119.919.518.017.417.217.5
Percentage of Assets14.214.315.415.217.918.217.517.217.519.222.222.521.620.323.422.420.019.118.919.2
Percentage of Assets us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Equipment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value3636353535353737313029292929292929282827
Percentage of PropertyPlantAndEquipmentGross11.011.110.810.911.011.012.012.010.810.610.410.310.410.310.610.610.811.011.010.8
Percentage of Assets13.113.312.913.313.213.314.414.212.312.812.412.512.512.312.412.212.012.112.111.9
Percentage of Assets us-gaap:Equipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherCapitalizedPropertyPlantAndEquipment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.70.70.70.70.5570.5570.5890.5890.4280.4280.4260.4280.2240.2250.2260.2260.148
Percentage of PropertyPlantAndEquipmentGross0.20.20.20.20.20.20.20.20.10.10.10.10.10.10.10.10.1
Percentage of Assets0.20.30.30.30.20.20.20.20.20.20.20.20.10.10.10.10.1
Percentage of Assets us-gaap:OtherCapitalizedPropertyPlantAndEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SoftwareDevelopment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value0.2410.2410.2410.2410.2410.2410.2410.2410.2410.2410.2410.2420.2730.310.2370.240.2440.2450.1790.177
Percentage of PropertyPlantAndEquipmentGross0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:SoftwareDevelopment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value9896949290888785767474757372747271676564
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets35.034.934.334.934.133.533.232.430.231.431.131.731.030.430.930.529.628.227.727.2

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:BusinessAcquisition

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.0060840.0060840.0060846.0840.0060840.0060846.5676.567
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment0.00.00.06.60.00.07.57.7
Percentage of Assets0.00.00.02.30.00.02.52.5
Percentage of Assets gwrs:RedRockUtilities0.00.00.00.00.00.00.00.0

gwrs:TurnerRanchesWaterandSanitationCompany


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3.5543.5543.5543.5543.5543.5543.5543.554-3.751-3.751
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment3.63.73.73.83.94.04.14.2-4.9-5.0
Percentage of Assets1.31.31.31.31.31.31.41.4-1.5-1.6
Percentage of Assets gwrs:TurnerRanchesWaterandSanitationCompany0.00.00.00.00.00.00.00.00.00.0

None

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


None
Period End2020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value600000.000000000000000000000
Percentage of AmortizationOfIntangibleAssets100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value236233234233230228226227211212212213211209207200196194195194
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets84.284.984.787.886.486.686.486.583.389.188.989.588.988.386.484.081.481.782.282.4

us-gaap:PropertyPlantAndEquipmentNet us-gaap:BusinessAcquisition

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.0198410.0198410.019841190.0198410.0198411919
Percentage of PropertyPlantAndEquipmentNet0.00.00.08.50.00.08.88.7
Percentage of Assets0.00.00.07.50.00.07.67.6
Percentage of Assets gwrs:RedRockUtilities0.00.00.00.00.00.00.00.0

None

us-gaap:Goodwill

us-gaap:Goodwill


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312016-03-312015-12-31
Value4398000.04398000.04398000.04398000.04398000.03559000.02642000.02639000.00000
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0
Percentage of Assets1.61.61.61.71.71.31.01.00.00.00.00.0

us-gaap:Goodwill us-gaap:BusinessAcquisition

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2848.02848.02848.02848000.02848.02010.01093000.01093000.0
Percentage of Goodwill0.10.10.164.80.10.141.441.4
Percentage of Assets0.00.00.01.10.00.00.40.4
Percentage of Assets gwrs:RedRockUtilities0.00.00.00.00.00.00.00.0

gwrs:TurnerRanchesWaterandSanitationCompany


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1549000.01549000.01549000.01549000.01549000.01549000.01549000.01546000.01743000.01743000.0
Percentage of Goodwill35.235.235.235.235.243.558.658.60.00.0
Percentage of Assets0.60.60.60.60.60.60.60.60.70.7
Percentage of Assets gwrs:TurnerRanchesWaterandSanitationCompany0.00.00.00.00.00.00.00.00.00.0

None

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1741000.01741000.01741000.01741000.01741000.01741000.01745000.01745000.01545000.01545000.01545000.01545000.01545000.01545000.01545000.01545000.01545000.01545000.01545000.01545000.0
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.60.70.70.70.70.70.60.60.60.60.60.60.60.60.60.60.70.7

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value67000.067000.067000.067000.067000.067000.066000.066000.00
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill3.83.83.83.83.83.83.83.80.0
Percentage of Assets0.00.00.00.00.00.00.00.00.0
Percentage of Assets gwrs:RedRockUtilities0.00.00.00.00.00.00.00.00.0

us-gaap:FranchiseRights


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value129000.0129000.0129000.0129000.0129000.0129000.0134000.0134000.00
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill7.47.47.47.47.47.47.77.70.0
Percentage of Assets0.00.00.00.00.00.00.10.10.0
Percentage of Assets us-gaap:FranchiseRights0.00.00.00.00.00.00.00.00.0

None

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1112121212121212121212121212121212121212
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.24.54.54.74.74.94.94.95.05.45.35.45.45.45.35.35.35.45.45.4

None

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value9.98510101010111111111111111111111111111111
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.63.83.94.14.14.24.34.34.44.74.74.74.74.74.74.74.74.74.74.8

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gwrs:AcquiredInfrastructureCoordinationAndFinancingAgreements


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value4.5825.1385.415.415.415.8245.8245.8245.8245.8245.8245.8245.8245.8245.8245.8245.8245.8245.8245.824
Percentage of FiniteLivedIntangibleAssetsNet45.948.750.050.050.051.951.951.951.951.951.951.951.951.951.951.951.951.951.951.9
Percentage of Assets1.61.92.02.02.02.22.22.22.32.42.42.42.42.42.42.42.42.42.52.5
Percentage of Assets gwrs:AcquiredInfrastructureCoordinationAndFinancingAgreements0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value2020202019181718171715151313131313132222
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.37.47.47.67.57.26.86.96.77.26.46.55.75.75.75.75.75.79.69.7

None

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value109.3859.7410109.5279.9389.576119.418108.97610101210129.7481310
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.73.43.53.84.13.63.83.64.43.94.53.84.44.35.44.65.14.15.64.5

None

us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtCurrent

gwrs:A2017WIFALoan, gwrs:NotesAndBondsPayable


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value001000.01000.01000.01000.01000.01000.00
Percentage of LongTermDebtCurrent0.00.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.0
Percentage of Assets gwrs:A2017WIFALoan gwrs:NotesAndBondsPayable0.00.00.00.00.00.00.00.00.0

gwrs:HarquahalaLoan, gwrs:NotesAndBondsPayable


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4000.07000.08000.06000.06000.05000.05000.05000.05000.05000.05000.05000.05000.06000.00
Percentage of LongTermDebtCurrent0.00.00.0600.0600.0500.0500.0500.0500.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets gwrs:HarquahalaLoan gwrs:NotesAndBondsPayable0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebtCurrent us-gaap:LongtermDebtType

gwrs:NotesAndBondsPayable


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value4000.07000.08000.07000.07000.06000.06000.09000.09000.08000.08000.08000.08000.09000.001885000.0
Percentage of LongTermDebtCurrent0.00.00.0700.0700.0600.0600.0900.0900.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.8
Percentage of Assets gwrs:NotesAndBondsPayable0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value195000.0862000.0674000.0992000.0726000.0715000.0316000.0604000.0366000.0523000.01576000.0321000.0241000.0845000.03039000.01791000.02653000.01001000.02450000.01322000.0
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.30.20.40.30.30.10.20.10.20.70.10.10.41.30.71.10.41.00.6

us-gaap:AccountsPayableCurrent us-gaap:BusinessAcquisition

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value26.026.026.026000.026.026.026000.0-26000.0
Percentage of AccountsPayableCurrent0.00.00.02.60.00.08.2-4.3
Percentage of Assets0.00.00.00.00.00.00.0-0.0
Percentage of Assets gwrs:RedRockUtilities0.00.00.00.00.00.00.00.0

gwrs:TurnerRanchesWaterandSanitationCompany


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value30000.030000.030000.030000.030000.030000.030000.0-30000.0-30000.0-30000.0
Percentage of AccountsPayableCurrent15.43.54.53.04.14.29.5-5.0-8.2-5.7
Percentage of Assets0.00.00.00.00.00.00.0-0.0-0.0-0.0
Percentage of Assets gwrs:TurnerRanchesWaterandSanitationCompany0.00.00.00.00.00.00.00.00.00.0

None

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1836000.02343000.02683000.02752000.01881000.01831000.01992000.02192000.02026000.01866000.01849000.02016000.02332000.01953000.01971000.02398000.02383000.01938000.02758000.02704000.0
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.91.01.00.70.70.80.80.80.80.80.81.00.80.81.01.00.81.21.1

None

us-gaap:DividendsPayableCurrent

us-gaap:DividendsPayableCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value544000.0544000.0543000.0519000.0514000.0514000.0512000.0512000.0507000.0466000.0464000.0464000.0470000.0470000.0458000.0458000.0448000.0487000.0452000.0
Percentage of DividendsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.2

None

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value8615000.06884000.07403000.07546000.08689000.07300000.08083000.07465000.09269000.07482000.07832000.07252000.08827000.07903000.08462000.07602000.08101000.06961000.06699000.05137000.0
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.12.52.72.83.32.83.12.83.63.13.33.03.73.33.53.23.42.92.82.2

us-gaap:AccruedLiabilitiesCurrent us-gaap:BusinessAcquisition

gwrs:TurnerRanchesWaterandSanitationCompany


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value49000.049000.049000.049000.049000.049000.049000.0-46000.0-46000.0-46000.0
Percentage of AccruedLiabilitiesCurrent0.60.70.70.60.60.70.6-0.6-0.5-0.6
Percentage of Assets0.00.00.00.00.00.00.0-0.0-0.0-0.0
Percentage of Assets gwrs:TurnerRanchesWaterandSanitationCompany0.00.00.00.00.00.00.00.00.00.0

None

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value236232231231229228225225213213214214214214212212212212205205
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets84.284.283.886.986.086.385.985.784.189.589.790.090.090.188.789.188.389.386.887.0

None

us-gaap:LongTermDebt

us-gaap:LongTermDebt


None
Period End2020-09-302020-06-302020-03-312019-12-31
Value115115115115
Percentage of LongTermDebt100.0100.0100.0100.0
Percentage of Assets40.941.741.643.2

None

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value114114114114114114114114114114114114114114114114114114102102
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.841.641.443.143.043.343.743.645.048.047.847.948.048.147.647.947.548.043.243.4

None

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value5214000.05101000.05130000.04919000.05010000.04857000.04597000.04350000.04162000.03966000.03228000.03114000.03719000.02981000.02440000.02383000.02426000.01861000.04164000.0
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.91.91.91.81.91.81.81.71.61.71.31.31.61.31.01.01.00.81.8

None

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value2657000.02093000.01876000.01669000.01516000.0809000.0680000.0660000.0719000.0615000.0579000.0962000.01005000.01043000.0896000.0913000.0826000.0904000.0286000.0252000.0
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.80.70.60.60.30.30.30.30.30.20.40.40.40.40.40.30.40.10.1

None

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value3334352426262727291513141313141515151720242527-32.842
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.012.412.79.39.910.110.310.611.66.55.86.25.65.65.96.46.66.67.68.50.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value333334242626262725121214151618192021192147495055
Percentage of StockholdersEquity99.399.799.499.199.299.299.299.287.179.893.696.2116.2125.4130.0128.4126.6133.5111.0108.0196.5193.8182.9-167.6
Percentage of Assets12.012.312.69.29.810.010.210.510.15.25.46.06.57.07.78.28.38.88.49.20.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value0.2270.2270.2260.2160.2160.2160.2150.2150.2150.1970.1960.1960.1960.1960.1960.1960.2830.1960.0020.0020.0020.0020.0020.002
Percentage of StockholdersEquity0.70.70.60.90.80.80.80.80.71.31.41.31.51.51.41.31.81.20.00.00.00.00.0-0.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value-0.1220.00.00.00.00.00.03.5852.9520.6960.376-2.358-3.561-4.465-4.515-4.425-5.571-1.976-1.598-23.473-23.876-22.961-87.892
Percentage of StockholdersEquity-0.40.00.00.00.00.00.012.218.95.02.5-17.6-26.8-31.4-29.7-27.9-35.3-11.0-8.0-96.5-93.8-83.0267.6
Percentage of Assets-0.00.00.00.00.00.00.01.41.20.30.2-1.0-1.5-1.9-1.9-1.8-2.3-0.8-0.70.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302015-12-312015-06-302014-12-31
Value-0.001-0.001-0.001-0.001-0.001-0.001-0.001-0.001-0.0010.00.00.00.0-0.0870.0870.00.0020.0
Percentage of StockholdersEquity-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.0-0.50.60.00.00.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.0-0.00.00.00.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStockCommon


None
Period End2020-09-302019-12-312018-12-312018-09-30
Value-0.0010.0-0.001-0.001
Percentage of StockholdersEquity-0.00.0-0.0-0.0
Percentage of Assets-0.00.0-0.0-0.0
Percentage of Assets us-gaap:TreasuryStockCommon0.00.00.00.0

None

us-gaap:CommonStockValue

us-gaap:CommonStockValue


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value227000.0227000.0226000.0216000.0216000.0216000.0215000.0215000.0215000.0197000.0196000.0196000.0196000.0196000.0196000.0196000.0283000.0196000.02000.02000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.0

None

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value3333342426262627251212141516181920211921
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.012.312.69.29.810.010.210.510.15.25.46.06.57.07.78.28.38.88.49.2

None

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value00000003585000.02952000.0696000.0376000.0-2358000.0-3561000.0-4465000.0-4515000.0-4425000.0-5571000.0-1976000.0-1598000.0
Percentage of RetainedEarningsAccumulatedDeficit0.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.01.41.20.30.2-1.0-1.5-1.9-1.9-1.8-2.3-0.8-0.7

None

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1000.01000.01000.0-1000.01000.01000.01000.0-1000.0-1000.000
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0
Percentage of Assets0.00.00.0-0.00.00.00.0-0.0-0.00.00.0

None

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:CommonStock


None
Period End2020-06-302020-03-312016-12-312016-09-30
Value0.0010.010.00.087
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.00.0100.0
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock

us-gaap:AdditionalPaidInCapital, us-gaap:CommonStock


None
Period End2020-06-302020-03-312018-09-30
Value-0.0031114
Percentage of StockIssuedDuringPeriodValueNewIssues-300.0115110.00.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital us-gaap:CommonStock0.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStock


None
Period End2020-06-302020-03-312018-09-30
Value-0.0021114
Percentage of StockIssuedDuringPeriodValueNewIssues-200.0115210.00.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.0

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6.5961.9313.170.3895.4631.933.7841.1314.8771.3123.9872.8764.6021.5792.099-0.2734.633-4.9012.436-0.9944.477-0.0020.764
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues61.319.538.54.554.921.249.013.754.212.153.736.954.319.430.9-3.856.6-64.635.7-14.055.0-0.010.0

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-2.092-1.873-3.534-2.274-2.926-3.058-1.798-7.3-0.964-3.962-1.099-4.184-4.04-6.262-6.512-4.04-1.8351.088-1.38-0.757530.282-1.342
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-19.4-18.9-42.9-26.2-29.4-33.5-23.3-88.5-10.7-36.6-14.8-53.6-47.7-76.9-95.9-56.0-22.414.3-20.2-10.6660.63.1-17.6

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-1.527-1.51810-1.157-2.167-0.85-1.438-1.24812-0.487-1.221-1.282-1.849-0.999-1.278-1.471-2.09717-1.151-3.503-45.063-1.423-1.292
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-14.2-15.4123.1-13.3-21.8-9.3-18.6-15.1138.7-4.5-16.4-16.4-21.8-12.3-18.8-20.4-25.6236.9-16.9-49.3-553.4-15.7-17.0

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6.5961.9313.170.3895.4631.933.7841.1314.8771.3123.9872.8764.6021.5792.099-0.2734.633-4.9012.436-0.9944.477-0.0020.764
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues61.319.538.54.554.921.249.013.754.212.153.736.954.319.430.9-3.856.6-64.635.7-14.055.0-0.010.0

None

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.131-0.1220.354-0.251.0470.7780.649-0.1060.6332.2560.322.7341.2030.4250.05-0.091.146-3.594-0.314-0.03210.403-0.915
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues10.5-1.24.3-2.910.58.58.4-1.37.020.84.335.114.25.20.7-1.214.0-47.4-4.6-0.4269.04.4-12.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-06-302015-03-31
Value1.131-0.1220.3541.0470.7780.649-0.1060.6332.2560.322.7341.2030.5640.05-0.091.146-3.594-0.3140.403-0.915
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0132.7100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues10.5-1.24.310.58.58.4-1.37.020.84.335.114.26.90.7-1.214.0-47.4-4.64.4-12.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value78000.0426000.0111000.0-133000.0172000.0300000.0-146000.0-373000.0142000.0202000.0-149000.0-18000.0-59000.0378000.0-122000.0-13000.0-42000.0379000.085000.0-153000.0-262000.0451000.0-161000.0
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.114-0.0290.21-0.090.1530.260.2470.1870.1970.7380.114-0.6050.7380.3390.0570.1280.564-1.963-0.339-0.304210.192-0.528
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:ShareBasedCompensation us-gaap:AwardType

us-gaap:ShareBasedCompensation

gwrs:PhantomShareUnitsAndStockAppreciationRights


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value200000.0200000.0500000.0400000.0600000.0300000.0103000.0165000.0694000.0450000.0-200000.0138000.097000.0689000.0176000.0600000.028000.0985000.0188000.0265000.050000.0217000.0163000.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensation us-gaap:AwardType, us-gaap:PlanName

us-gaap:EmployeeStockOption, gwrs:TwentyNineteenStockOptionGrantMember


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value49000.049000.049000.026000.0000
Percentage of ShareBasedCompensation24.524.59.84.30.00.00.0

us-gaap:EmployeeStockOption, gwrs:TwentySeventeenStockOptionGrant


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value67000.067000.067000.0102000.067000.066000.065000.067000.067000.054000.079000.044000.0
Percentage of ShareBasedCompensation33.533.513.425.511.222.063.19.714.9-27.057.245.4

us-gaap:EmployeeStockOption, gwrs:TwentySixteenStockOptionGrant


None
Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value00000024000.043000.044000.043000.043000.0265000.0586000.043000.019000.00
Percentage of ShareBasedCompensation0.00.00.00.00.00.05.3-21.531.944.36.2150.697.7153.61.90.0

us-gaap:ShareBasedCompensation us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

gwrs:MembersOfManagement, gwrs:Q22020, us-gaap:RestrictedStock


None
Period End2020-09-302020-06-30
Value200000.0700000.0
Percentage of ShareBasedCompensation100.0350.0

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-2.092-1.873-3.534-2.274-2.926-3.058-1.798-7.3-0.964-3.962-1.099-4.184-4.04-6.262-6.512-4.04-1.8351.088-1.38-0.757530.282-1.342
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-19.4-18.9-42.9-26.2-29.4-33.5-23.3-88.5-10.7-36.6-14.8-53.6-47.7-76.9-95.9-56.0-22.414.3-20.2-10.6660.63.1-17.6

None

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.0911.8743.5253.4022.9273.061.7981.3830.9461.3571.1014.2833.8316.2666.5054.0751.8791.2631.3711.1781.1680.590.419
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-1.527-1.51810-1.157-2.167-0.85-1.438-1.24812-0.487-1.221-1.282-1.849-0.999-1.278-1.471-2.09717-1.151-3.503-45.063-1.423-1.292
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-14.2-15.4123.1-13.3-21.8-9.3-18.6-15.1138.7-4.5-16.4-16.4-21.8-12.3-18.8-20.4-25.6236.9-16.9-49.3-553.4-15.7-17.0

None

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value0.00.00.0040.00.00.0310.1260.0140.00.00.00.00.00.0
Percentage of ProceedsFromIssuanceOfLongTermDebt0.00.0100.00.00.0100.0100.0100.00.00.00.00.00.00.0

None

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.6331.6341.6291.5451.5421.5411.5371.4831.5221.3951.3911.3871.3571.3331.3221.3021.3311.2431.161.086241.1811.112
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:Dividends us-gaap:StatementEquityComponents

us-gaap:Dividends

us-gaap:RetainedEarnings


None
Period End2020-09-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1009000.0354000.01047000.0778000.0649000.01494000.01395000.0696000.0
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:RevolvingCreditFacility


None
Period End2020-05-042018-04-20
Value0.020.0225
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations us-gaap:RevolvingCreditFacility0.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, us-gaap:SubsequentEvent


None
Period End2020-05-04
Value0.02
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations us-gaap:RevolvingCreditFacility us-gaap:SubsequentEvent0.0

None

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-31
Value632500.0632500.0633000.0640800.0390800.0498100.0498000.0499900.0555500.0717680.0740000.0740000.0300000.0368400.047422.047422.047422.047422.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap:AwardType, us-gaap:PlanName

us-gaap:EmployeeStockOption, gwrs:TwentyNineteenStockOptionGrantMember


None
Period End2020-06-302020-03-312019-09-30
Value245600.0245600.0250000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber38.838.839.0

us-gaap:EmployeeStockOption, gwrs:TwentySeventeenStockOptionGrant


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value386900.0386900.0386900.0390800.0390800.0395900.0399900.0405500.0409400.0465000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber61.261.261.161.0100.079.580.073.057.062.8

us-gaap:EmployeeStockOption, gwrs:TwentySixteenStockOptionGrant


None
Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-09-30
Value000100000.0100000.0150000.0275000.0275000.0275000.0300000.0325000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber0.00.00.020.120.027.038.337.237.2100.0685.3

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap:PlanName

gwrs:TwentyNineteenStockOptionGrantMember


None
Period End2020-06-302020-03-312019-09-30
Value245600.0245600.0250000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber38.838.839.0

gwrs:TwentySeventeenStockOptionGrant


None
Period End2020-06-302020-03-312019-09-30
Value386900.0386900.0390800.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber61.261.261.0

None

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardDate, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

gwrs:Q12016, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.00.034830.00.00.00.034830.00.00.00.034830.00.00.00.0348334
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0100.0

gwrs:Q12017, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.0227120.00.00.00.0227120.00.00.00.0227120.00.00.00.022712
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.065.20.00.00.065.20.00.00.065.20.00.00.065.2

gwrs:Q12018, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.0309070.00.00.00.0309070.00.00.00.030907
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.088.70.00.00.088.70.00.00.088.7

gwrs:Q12019, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.032190.00.00.00.03219
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.092.40.00.00.092.4

gwrs:Q12020, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-31
Value0.00.022481
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.064.5

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType

us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.00.143120.0087750.00.00.1494670.0764920.00.0087750.1172770.4850790.00.00.171637633
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0410.90.00.00.0429.10.00.00.0336.70.00.00.0492.81820.3

us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.00.7350.00.00.00.9350.00.00.00.9350.1520910.1030.00.7990.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.02110.20.00.00.02684.50.00.00.02684.50.00.00.02294.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

gwrs:MembersOfManagement, gwrs:Q12015, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-12-312019-09-30
Value0.00.2990.00.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0858.50.00.0

gwrs:MembersOfManagement, gwrs:Q12018, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-12-312019-09-30
Value0.00.0330.00.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.094.70.00.0

gwrs:MembersOfManagement, gwrs:Q22020, us-gaap:RestrictedStock


None
Period End2020-06-30
Value0.17749
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0

gwrs:MembersOfManagement, gwrs:Q32017, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-12-312019-09-30
Value0.00.1030.00.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0295.70.00.0

srt:ExecutiveOfficer, gwrs:Q22015, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-12-312019-09-30
Value0.00.30.00.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0861.30.00.0

None

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2017189.09512111313204.2627.4145.685
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gwrs:EmployeeMedicalClaimsPaid

gwrs:EmployeeMedicalClaimsPaid


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value200000.0100000.0300000.00100000.0100000.0136000.0112000.0149000.062000.0142000.062000.014000.090000.072000.060000.0122000.0280000.0187000.0116000.0134000.056000.0
Percentage of EmployeeMedicalClaimsPaid100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gwrs:GrowthPremiumsReceived us-gaap:BusinessAcquisition

gwrs:GrowthPremiumsReceived

gwrs:ValenciaWaterCompany


None
Period End2020-09-302019-09-302019-06-302018-09-302018-06-30
Value100000.0100000.0100000.0100000.0200000.0
Percentage of GrowthPremiumsReceived100.0100.0100.0100.0100.0

gwrs:OtherNonOperatingIncomeExpenseRelatedParty

gwrs:OtherNonOperatingIncomeExpenseRelatedParty


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0088000.097000.089000.027000.068000.052000.060000.0-2000.065000.0-12000.0-33000.0214000.085000.072000.0-41000.0-101000.0-32000.0-31000.025000.035000.0
Percentage of OtherNonOperatingIncomeExpenseRelatedParty0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gwrs:RegulatedOperatingRevenueWasteWaterAndRecycledWaterServices

gwrs:RegulatedOperatingRevenueWasteWaterAndRecycledWaterServices


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value5.2385.1264.8234.874.9624.8624.5694.3244.5154.5184.2974.2634.2844.233.9883.9184.0933.9223.8073.7773.8483.7933.602
Percentage of RegulatedOperatingRevenueWasteWaterAndRecycledWaterServices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gwrs:ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestWeightedAverageExercisePrice us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

gwrs:ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestWeightedAverageExercisePrice

gwrs:MembersOfManagement, gwrs:Q12015, us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value004.2600
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestWeightedAverageExercisePrice0.00.0100.00.00.0

gwrs:MembersOfManagement, gwrs:Q12018, us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value008.9900
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestWeightedAverageExercisePrice0.00.0211.00.00.0

gwrs:MembersOfManagement, gwrs:Q32017, us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value009.400
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestWeightedAverageExercisePrice0.00.0220.70.00.0

srt:ExecutiveOfficer, gwrs:Q22015, us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value005.1300
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestWeightedAverageExercisePrice0.00.0120.40.00.0

gwrs:TaxExpenseonContributions gwrs:Responsibleparty

gwrs:TaxExpenseonContributions

gwrs:Contributor


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value54.4500.55000.55
Percentage of TaxExpenseonContributions100.00.0100.00.00.0100.0

gwrs:TaxPayer


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value44.5500.45000.45
Percentage of TaxExpenseonContributions81.80.081.80.00.081.8

gwrs:UtilitiesOperatingExpenseMaintenanceAndOperationsRelatedParty

gwrs:UtilitiesOperatingExpenseMaintenanceAndOperationsRelatedParty


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value00391000.0435000.0437000.0415000.0453000.0386000.0404000.0356000.0371000.0366000.0365000.0360000.0450000.0467000.0465000.0472000.0467000.0483000.0618000.0611000.0
Percentage of UtilitiesOperatingExpenseMaintenanceAndOperationsRelatedParty0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalDividendsInExcessOfRetainedEarnings

us-gaap:AdjustmentsToAdditionalPaidInCapitalDividendsInExcessOfRetainedEarnings


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-06-302015-03-31
Value1.6331.6331.6281.541-1.542-1.5371.5321.522-1.3951.3911.381.3571.3451.3221.3121.2921.2141.2241.211.134
Percentage of AdjustmentsToAdditionalPaidInCapitalDividendsInExcessOfRetainedEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalDividendsInExcessOfRetainedEarnings us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-06-302015-03-31
Value0.6241.6331.2740.4940.7640.888-1.9470.0281.3951.3911.381.3571.3451.3221.3121.2921.2141.2241.211.134
Percentage of AdjustmentsToAdditionalPaidInCapitalDividendsInExcessOfRetainedEarnings38.2100.078.332.1-49.5-57.8-127.11.8-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.2750.7680.1150.0930.0660.0650.0670.0680.090.0980.1210.088-0.1780.2650.2650.265
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.2750.7680.1150.0930.0660.0650.0670.0680.090.0980.1210.088-0.1780.2650.2650.265
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock

us-gaap:AdditionalPaidInCapital, us-gaap:CommonStock


None
Period End2020-03-31
Value0.115
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions100.0

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AmortizationOfFinancingCostsAndDiscounts


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value11000.078000.014000.015000.014000.09000.050000.068000.011000.011000.011000.011000.011000.011000.011000.011000.012000.0360000.045000.046000.046000.056000.056000.0
Percentage of AmortizationOfFinancingCostsAndDiscounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:SubsequentEventType

us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:SubsequentEvent


None
Period End2020-10-29
Value80000.0
Percentage of BusinessCombinationConsiderationTransferred1100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-1195000.0443000.01046000.044000.0274000.0646000.0238000.0-167000.0-306000.01069000.0-1122000.0-118000.0-2509000.04839000.01738000.01008000.0119000.044000.0-245000.081000.0260000.088000.0
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value2.977-1.469.7650.37-1.9780.54816-3.1521.729
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.070.070.070.080.070.070.070.070.070.070.070.070.070.070.070.060.070.060.080.061.240.060.07
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared us-gaap:Dividends, us-gaap:SubsequentEventType

gwrs:AnnualDividendsDeclared, us-gaap:SubsequentEvent


None
Period End2020-11-052017-11-092017-11-082017-05-102017-05-092016-11-142016-11-13
Value0.292080.28350.276720.276720.270.270.264
Percentage of CommonStockDividendsPerShareDeclared0.00.00.00.00.00.00.0

gwrs:MonthlyDividendsDeclared, us-gaap:SubsequentEvent


None
Period End2020-11-052017-11-092017-11-082017-05-102017-05-092016-11-142016-11-13
Value0.024340.023630.023060.023060.02250.02250.022
Percentage of CommonStockDividendsPerShareDeclared0.00.00.00.00.00.00.0

us-gaap:DebtInstrumentDecreaseForgiveness

us-gaap:DebtInstrumentDecreaseForgiveness


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value000031000.0000
Percentage of DebtInstrumentDecreaseForgiveness0.00.00.00.0100.00.00.00.0

us-gaap:DeferredCompensationArrangementWithIndividualCompensationExpense

us-gaap:DeferredCompensationArrangementWithIndividualCompensationExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value639000.01651000.0-582000.0639000.0810000.0424000.0178000.0239000.0880000.0604000.0-9000.0321000.0147000.0657000.0425000.0984000.0236000.01342000.0214000.0300000.055000.0256000.0187000.0
Percentage of DeferredCompensationArrangementWithIndividualCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation

us-gaap:Depreciation


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2312000.02197000.02113000.02376000.01957000.02009000.02011000.01974000.01807000.01889000.01799000.01744000.01710000.01808000.01646000.01528000.01524000.01610000.01617000.01687000.01894000.02320000.02312000.0
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0000-9000.0-70000.0-44000.0-61000.0-49000.0-111000.0-30000.0-101000.0-127000.0122000.0-7000.0-15000.0-130000.0-188000.0-117000.0-112000.0-56000.0-44000.01000000.0
Percentage of IncomeLossFromEquityMethodInvestments0.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2046000.0-1538000.0587000.0-1829000.0803000.0-973000.0415000.0-1668000.01128000.0-1654000.01506000.0-612000.0316000.0-939000.0-12000.0-3460000.01641000.0-4700000.02432000.0-2337000.02258000.0-1960000.0-463000.0
Percentage of IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentAssets

us-gaap:IncreaseDecreaseInOtherCurrentAssets


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value196000.0574000.0-21000.0-281000.0-174000.0432000.083000.0-526000.0216000.0363000.057000.0-407000.0-248000.0671000.0100000.0-566000.0528000.0-929000.01382000.0761000.0523000.0625000.0332000.0
Percentage of IncreaseDecreaseInOtherCurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value294000.0-19000.0-20000.0-19000.0-19000.0-19000.0-18000.0-73000.00001843000.0-25000.0-28000.0-27000.0-26000.0-28000.0-34000.0-29000.0-30000.0-32000.0-35000.0-50000.0
Percentage of IncreaseDecreaseInOtherNoncurrentAssets100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities

us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value853000.0124000.0502000.073000.0641000.0116000.078000.0-605000.0447000.0-2001000.059000.0647000.00-2000.0-30000.01000.0-21000.028000.09000.0
Percentage of IncreaseDecreaseInOtherNoncurrentLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements us-gaap:PlanName

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

gwrs:TwentySeventeenStockOptionGrant


None
Period End2020-03-312019-09-30
Value58505.034406.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0

us-gaap:InterestPaid

us-gaap:InterestPaid


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2608000.04000.05000.02610000.06000.02608000.04000.02607000.02000.02608000.03000.02605000.08000.02478000.07000.03478000.06000.03529000.063000.03702000.0181000.0
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value9000.027000.052000.036000.049000.061000.057000.064000.022000.08000.07000.05000.04000.06000.04000.06000.05000.04000.03000.03000.04000.02000.02000.0
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasesRentExpenseNet us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

us-gaap:OperatingLeasesRentExpenseNet

srt:OfficeBuilding


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value44000.044000.044000.045000.044000.045000.046000.031000.025000.024000.025000.0
Percentage of OperatingLeasesRentExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNonoperatingGainsLosses

us-gaap:OtherNonoperatingGainsLosses


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-30
Value-1000.0-548000.0-2000.0-6000.0-1000.002000.0-1000.00-13000.041000.017000.0-12000.0-1000.0-4000.012000.013000.0176000.00
Percentage of OtherNonoperatingGainsLosses100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PaymentsForLoans

us-gaap:PaymentsForLoans


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.0010.0170.00.00.0030.0360.0010.0010.0010.0060.0050.00.00.0
Percentage of PaymentsForLoans100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value1000.0-1000.09000.0-128000.0-1000.0-2000.00128000.000-64000.0-95000.00-5000.05000.000
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.00.0100.00.00.0100.0100.00.0100.0100.00.00.0

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsOfDebtIssuanceCosts


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value053000.000020000.020000.0115000.0-20000.022000.017000.020000.000001000.0
Percentage of PaymentsOfDebtIssuanceCosts0.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0

us-gaap:PaymentsOfStockIssuanceCosts

us-gaap:PaymentsOfStockIssuanceCosts


None
Period End2020-09-302020-06-302020-01-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302016-12-312016-09-30
Value03000.01000000.0218000.0000000005000.0
Percentage of PaymentsOfStockIssuanceCosts0.0100.0100.0100.00.00.00.00.00.00.00.00.0100.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireBusinessesGross

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-10-16
Value005851.05845100.00-5845100.05851000.05851300.0
Percentage of PaymentsToAcquireBusinessesGross0.00.0100.0100.00.0100.0100.0100.0

us-gaap:ProceedsFromAdvancesForConstruction

us-gaap:ProceedsFromAdvancesForConstruction


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1094000.0201000.0280000.0456000.0278000.0318000.0147000.0238000.0197000.0188000.0194000.0139000.0165000.0159000.0111000.0112000.059000.0122000.053000.075000.0138000.094000.050000.0
Percentage of ProceedsFromAdvancesForConstruction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOrSaleOfEquity

us-gaap:ProceedsFromIssuanceOrSaleOfEquity


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302016-12-312016-09-30
Value0.00.0110.00.00.00.00.00.00.00.00.0
Percentage of ProceedsFromIssuanceOrSaleOfEquity0.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value57000.03000.040000.016000.016000.011000.07000.025000.071000.0-28000.025000.041000.032000.034000.021000.025000.0-13000.036000.022000.014000.027000.012000.016000.0
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount

us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount


None
Period End2020-09-30
Value3600000.0
Percentage of PublicUtilitiesApprovedRateIncreaseDecreaseAmount100.0

us-gaap:RegulatedOperatingRevenueWater

us-gaap:RegulatedOperatingRevenueWater


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value5.4924.6753.3883.7994.9634.2433.1383.8484.4653.9163.1153.524.1653.8972.7853.2754.0673.6472.9893.1824.1315.1143.893
Percentage of RegulatedOperatingRevenueWater100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty us-gaap:ProductOrService, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty

gwrs:FATHOMServices, gwrs:GlobalWaterManagement


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00400000.0400000.0400000.0400000.0500000.0400000.0400000.0
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty0.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfAdvancesForConstruction

us-gaap:RepaymentsOfAdvancesForConstruction


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value959000.00049000.0892000.0011000.04000.0892000.00010000.011000.0553000.0
Percentage of RepaymentsOfAdvancesForConstruction100.00.00.0100.0100.00.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:RepaymentsOfDebtAndCapitalLeaseObligations

us-gaap:RepaymentsOfDebtAndCapitalLeaseObligations


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value23000.028000.026000.024000.011000.017000.012000.09000.010000.07000.01000.0-1000.0013000.067000.0270000.036000.036000.036000.027000.024000.026000.022000.0
Percentage of RepaymentsOfDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction

us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction


None
Period End2020-06-302020-03-312018-07-20
Value0870000.01720000.0
Percentage of SaleOfStockNumberOfSharesIssuedInTransaction0.0100.0100.0

us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStock


None
Period End2020-06-302020-03-312018-12-312018-07-202018-09-30
Value49163.01000000.001720000.01720000.0
Percentage of SaleOfStockNumberOfSharesIssuedInTransaction0.0114.90.00.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested us-gaap:AwardDate, us-gaap:AwardType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested

gwrs:Q12016, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0000019000.029000.030000.026000.027000.028000.029000.025000.026000.06000.023000.017000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gwrs:Q12017, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0024000.023000.019000.019000.025000.019000.020000.017000.017000.018000.019000.016000.00
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.0131.665.566.765.463.064.365.564.00.0

gwrs:Q12018, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value26000.026000.033000.031000.026000.025000.027000.026000.027000.023000.000000
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.0142.189.790.088.50.00.00.00.00.0

gwrs:Q12019, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value27000.027000.035000.032000.027000.027000.000000
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.00.00.00.00.00.0

gwrs:Q12020, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value19000.019000.0000
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested us-gaap:AwardType

us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-01-31
Value72000.072000.092000.086000.072000.071000.071000.074000.077000.066000.066000.069000.072000.062000.051000.068000.022000.033000.044000.041000.048000.01300000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.0373.7255.2256.7253.8244.4246.4248.3248.0196.21133.395.7194.10.00.00.00.0

us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value00300000.00891000.0447000.0032000.0415000.00349000.000343000.0335000.0-23000.086000.000080000.05000.018000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.00.0110.31383.30.01292.60.00.01372.01288.5-383.3373.90.00.00.00.00.00.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

gwrs:MembersOfManagement, gwrs:Q12015, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value000481000.000000
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.00.00.00.0

gwrs:MembersOfManagement, gwrs:Q12018, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00027000.000000
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.00.00.00.0

gwrs:MembersOfManagement, gwrs:Q32017, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value000125000.000000
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.00.00.00.0

srt:ExecutiveOfficer, gwrs:Q22015, us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00300000.00258000.0447000.0032000.0415000.00
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested0.00.00.00.00.00.00.0110.31383.30.0

us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations

us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2584000.02340000.02232000.01820000.01914000.01780000.01723000.01692000.01808000.01621000.01509000.01588000.01574000.01451000.01474000.01419000.01561000.01596000.01612000.01473000.01690000.02057000.01860000.0
Percentage of UtilitiesOperatingExpenseMaintenanceAndOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


None
Period End2020-11-022020-08-032020-05-04
Value222222
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0

gwrs:AdvancesInAidOfConstruction

gwrs:AdvancesInAidOfConstruction


None
Period End2020-09-302019-12-31
Value7267
Percentage of AdvancesInAidOfConstruction100.0100.0

gwrs:CollectiveRevenueRequirementPhaseInYearFive

gwrs:CollectiveRevenueRequirementPhaseInYearFive


None
Period End2020-09-30
Value335.0
Percentage of CollectiveRevenueRequirementPhaseInYearFive100.0

gwrs:CollectiveRevenueRequirementPhaseInYearFour

gwrs:CollectiveRevenueRequirementPhaseInYearFour


None
Period End2020-09-30
Value335.0
Percentage of CollectiveRevenueRequirementPhaseInYearFour100.0

gwrs:CollectiveRevenueRequirementPhaseInYearOne

gwrs:CollectiveRevenueRequirementPhaseInYearOne


None
Period End2020-09-30
Value1083.0
Percentage of CollectiveRevenueRequirementPhaseInYearOne100.0

gwrs:CollectiveRevenueRequirementPhaseInYearSeven

gwrs:CollectiveRevenueRequirementPhaseInYearSeven


None
Period End2020-09-30
Value335.0
Percentage of CollectiveRevenueRequirementPhaseInYearSeven100.0

gwrs:CollectiveRevenueRequirementPhaseInYearSix

gwrs:CollectiveRevenueRequirementPhaseInYearSix


None
Period End2020-09-30
Value335.0
Percentage of CollectiveRevenueRequirementPhaseInYearSix100.0

gwrs:CollectiveRevenueRequirementPhaseInYearThree

gwrs:CollectiveRevenueRequirementPhaseInYearThree


None
Period End2020-09-30
Value335.0
Percentage of CollectiveRevenueRequirementPhaseInYearThree100.0

gwrs:CollectiveRevenueRequirementPhaseInYearTwo

gwrs:CollectiveRevenueRequirementPhaseInYearTwo


None
Period End2020-09-30
Value887.0
Percentage of CollectiveRevenueRequirementPhaseInYearTwo100.0

gwrs:CumulativeRevenueRequirementIncreaseInFifthYear

gwrs:CumulativeRevenueRequirementIncreaseInFifthYear


None
Period End2020-09-30
Value2975.0
Percentage of CumulativeRevenueRequirementIncreaseInFifthYear100.0

gwrs:CumulativeRevenueRequirementIncreaseInFirstYear

gwrs:CumulativeRevenueRequirementIncreaseInFirstYear


None
Period End2020-09-30
Value1083.0
Percentage of CumulativeRevenueRequirementIncreaseInFirstYear100.0

gwrs:CumulativeRevenueRequirementIncreaseInFourthYear

gwrs:CumulativeRevenueRequirementIncreaseInFourthYear


None
Period End2020-09-30
Value2640.0
Percentage of CumulativeRevenueRequirementIncreaseInFourthYear100.0

gwrs:CumulativeRevenueRequirementIncreaseInSecondYear

gwrs:CumulativeRevenueRequirementIncreaseInSecondYear


None
Period End2020-09-30
Value1970.0
Percentage of CumulativeRevenueRequirementIncreaseInSecondYear100.0

gwrs:CumulativeRevenueRequirementIncreaseInSeventhYear

gwrs:CumulativeRevenueRequirementIncreaseInSeventhYear


None
Period End2020-09-30
Value3645.0
Percentage of CumulativeRevenueRequirementIncreaseInSeventhYear100.0

gwrs:CumulativeRevenueRequirementIncreaseInSixthYear

gwrs:CumulativeRevenueRequirementIncreaseInSixthYear


None
Period End2020-09-30
Value3310.0
Percentage of CumulativeRevenueRequirementIncreaseInSixthYear100.0

gwrs:CumulativeRevenueRequirementIncreaseInThirdYear

gwrs:CumulativeRevenueRequirementIncreaseInThirdYear


None
Period End2020-09-30
Value2305.0
Percentage of CumulativeRevenueRequirementIncreaseInThirdYear100.0

gwrs:CustomerAndMeterDeposits

gwrs:CustomerAndMeterDeposits


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1513000.01504000.01522000.01445000.01467000.01434000.01464000.01460000.01416000.01374000.01381000.01395000.01401000.01423000.01406000.01482000.01504000.01639000.01639000.01706000.0
Percentage of CustomerAndMeterDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gwrs:CustomerAndMeterDeposits us-gaap:BusinessAcquisition

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value76.0-76.0-76.0-76000.0-76.0-76.0-76000.0-76000.0
Percentage of CustomerAndMeterDeposits0.0-0.0-0.0-5.3-0.0-0.0-5.2-5.2

gwrs:DefinedBenefitPlanExpectedFutureBenefitPayments us-gaap:AwardType

gwrs:DefinedBenefitPlanExpectedFutureBenefitPayments

us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value428000.0478000.0548000.0554000.0544000.0597000.0370000.0412000.0447000.0247000.0326000.0408000.0421000.0299000.0308000.0389000.0327000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value117000.0145000.0158000.0264000.0246000.0345000.0813000.0871000.01005000.01195000.01382000.01450000.01355000.01698000.02015000.02608000.01162000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPayments27.330.328.847.745.257.8219.7211.4224.8483.8423.9355.4321.9567.9654.2670.4355.4

gwrs:GrowthPremiumReceivableForEachNewWaterMeterInstalled us-gaap:BusinessAcquisition

gwrs:GrowthPremiumReceivableForEachNewWaterMeterInstalled

gwrs:ValenciaWaterCompany


None
Period End2020-09-30
Value3000.0
Percentage of GrowthPremiumReceivableForEachNewWaterMeterInstalled100.0

gwrs:MaximumPayoutOfGrowthPremiumReceivable us-gaap:BusinessAcquisition

gwrs:MaximumPayoutOfGrowthPremiumReceivable

gwrs:ValenciaWaterCompany


None
Period End2020-09-30
Value45
Percentage of MaximumPayoutOfGrowthPremiumReceivable100.0

gwrs:SharesExercised us-gaap:AwardType, us-gaap:PlanName

gwrs:SharesExercised

us-gaap:EmployeeStockOption, gwrs:TwentySeventeenStockOptionGrant


None
Period End2020-03-312019-12-312019-09-302019-06-302018-09-30
Value10154.010154.08204.08204.04204.0
Percentage of SharesExercised100.0100.0100.0100.0100.0

us-gaap:EmployeeStockOption, gwrs:TwentySixteenStockOptionGrant


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value325000.0325000.0325000.0325000.0225000.0225000.0
Percentage of SharesExercised3200.73200.73961.53961.50.05352.0

gwrs:TaxReformRevenueReduction gwrs:Utility, us-gaap:Range, us-gaap:RegulatoryLiability

gwrs:TaxReformRevenueReduction

gwrs:PaloVerde, srt:Maximum, gwrs:TaxCutsandJobsAct


None
Period End2021-12-312018-12-31
Value669000.0449000.0
Percentage of TaxReformRevenueReduction100.0100.0

gwrs:Santacruz, srt:Maximum, gwrs:TaxCutsandJobsAct


None
Period End2021-12-312018-12-31
Value415000.0312000.0
Percentage of TaxReformRevenueReduction62.069.5

gwrs:TaxReformRevenueReduction gwrs:Utility, us-gaap:RegulatoryLiability

gwrs:PaloVerde, gwrs:TaxCutsandJobsAct


None
Period End2021-12-312019-12-312018-12-31
Value669000.0523000.0449000.0
Percentage of TaxReformRevenueReduction100.00.0100.0

gwrs:Santacruz, gwrs:TaxCutsandJobsAct


None
Period End2021-12-312019-12-312018-12-31
Value415000.0346000.0312000.0
Percentage of TaxReformRevenueReduction62.00.069.5

gwrs:TaxReformRevenueReduction us-gaap:RegulatoryLiability

gwrs:TaxCutsandJobsAct


None
Period End2021-12-312019-12-312019-03-312018-12-31
Value1105000.0890000.0782000.0782000.0
Percentage of TaxReformRevenueReduction165.20.00.0174.2

gwrs:TaxReformRevenueReduction us-gaap:RegulatoryLiability, us-gaap:SubsequentEventType

gwrs:TaxCutsandJobsAct, us-gaap:SubsequentEvent


None
Period End2021-12-31
Value1100000.0
Percentage of TaxReformRevenueReduction164.4

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccountsReceivableGrossCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value2284000.02205000.01795000.01718000.01873000.01757000.01498000.01633000.01972000.01820000.01531000.01691000.01741000.01808000.01402000.01547000.01326000.0
Percentage of AccountsReceivableGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1774000.01163000.0582000.01095000.01653000.01104000.0562000.01073000.01570000.01047000.0514000.0989000.0459000.0945000.0472000.0910000.0518000.0976000.0496000.0958000.0
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedBonusesCurrent

us-gaap:AccruedBonusesCurrent


None
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302018-12-31
Value702000.0450000.0344000.0581000.0377000.0325000.0
Percentage of AccruedBonusesCurrent100.0100.0100.0100.0100.0100.0

us-gaap:AccruedFeesAndOtherRevenueReceivable

us-gaap:AccruedFeesAndOtherRevenueReceivable


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value2581000.02606000.02116000.02048000.02323000.02333000.02006000.01998000.02011000.02135000.01799000.01759000.01886000.01954000.01631000.01619000.01892000.01848000.01803000.01745000.0
Percentage of AccruedFeesAndOtherRevenueReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedLiabilitiesCurrentAndNoncurrent us-gaap:BusinessAcquisition

us-gaap:AccruedLiabilitiesCurrentAndNoncurrent

gwrs:RedRockUtilities


None
Period End2020-09-30
Value47.0
Percentage of AccruedLiabilitiesCurrentAndNoncurrent100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value138000.080000.094000.087000.093000.0133000.0163000.0145000.0196000.0115000.0177000.0163000.0153000.0129000.074000.076000.0194000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationCurrent

us-gaap:AssetRetirementObligationCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value697000.0697000.0697000.0697000.0555000.0555000.0555000.0555000.0427000.0427000.0427000.0427000.0216000.0
Percentage of AssetRetirementObligationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2.1352.1352.1352.1325.1188.0958.069108.0120.0
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:BusinessCombinationContingentConsiderationLiability

us-gaap:BusinessCombinationContingentConsiderationLiability


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value838000.0838000.0838000.0838000.00
Percentage of BusinessCombinationContingentConsiderationLiability100.0100.0100.0100.00.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel3


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value838000.0838000.0838000.0838000.00
Percentage of BusinessCombinationContingentConsiderationLiability100.0100.0100.0100.00.0

us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent

us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value1773000.01773000.01773000.01773000.01773000.0934000.0934000.0934000.0934000.0934000.0934000.0934000.0934000.0934000.0934000.0934000.0934000.04688000.0
Percentage of BusinessCombinationContingentConsiderationLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

gwrs:RedRockUtilities


None
Period End2020-09-30
Value196.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value3003.03003.03003.03003000.03003.03841.04758000.04758000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet100.0100.0100.0100.0100.0100.0100.0100.0

gwrs:TurnerRanchesWaterandSanitationCompany


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1251000.01251000.01251000.01251000.01251000.01251000.01251000.01254000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet41658.341658.341658.341.741658.332569.626.326.4

us-gaap:CapitalLeaseObligationsCurrent

us-gaap:CapitalLeaseObligationsCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value114000.0112000.0111000.0110000.080000.072000.069000.038000.037000.031000.021000.0007000.025000.0138000.0143000.0146000.0109000.0
Percentage of CapitalLeaseObligationsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalLeaseObligationsNoncurrent

us-gaap:CapitalLeaseObligationsNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value165000.0194000.0222000.0251000.0189000.0187000.0208000.096000.0106000.092000.072000.00006000.054000.0212000.0244000.0276000.0178000.0
Percentage of CapitalLeaseObligationsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalLeasesFutureMinimumPaymentsDue

us-gaap:CapitalLeasesFutureMinimumPaymentsDue


None
Period End2020-09-30
Value279000.0
Percentage of CapitalLeasesFutureMinimumPaymentsDue100.0

us-gaap:CapitalLeasesFutureMinimumPaymentsDueCurrent

us-gaap:CapitalLeasesFutureMinimumPaymentsDueCurrent


None
Period End2020-09-30
Value28000.0
Percentage of CapitalLeasesFutureMinimumPaymentsDueCurrent100.0

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInFourYears

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInFourYears


None
Period End2020-09-30
Value48000.0
Percentage of CapitalLeasesFutureMinimumPaymentsDueInFourYears100.0

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInThreeYears

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInThreeYears


None
Period End2020-09-30
Value88000.0
Percentage of CapitalLeasesFutureMinimumPaymentsDueInThreeYears100.0

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInTwoYears

us-gaap:CapitalLeasesFutureMinimumPaymentsDueInTwoYears


None
Period End2020-09-30
Value115000.0
Percentage of CapitalLeasesFutureMinimumPaymentsDueInTwoYears100.0

us-gaap:CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments

us-gaap:CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments


None
Period End2020-09-30
Value15000.0
Percentage of CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments100.0

us-gaap:CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments

us-gaap:CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments


None
Period End2020-09-30
Value264000.0
Percentage of CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByAssetClass

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:DemandDeposits


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2135000.02135000.02135000.02132000.05118000.05095000.05069000.07043000.05012000.0
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DemandDeposits, us-gaap:FairValueInputsLevel1


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2135000.02135000.02135000.02132000.05118000.05095000.05069000.07043000.05012000.00
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

gwrs:HookUpFeeFunds, us-gaap:FairValueInputsLevel2, us-gaap:CertificatesOfDeposit


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1526000.01133000.01018000.0627000.0611000.047000.09000.09000.0
Percentage of CashAndCashEquivalentsFairValueDisclosure71.553.147.729.411.90.90.20.1

us-gaap:CertificatesOfDeposit, us-gaap:FairValueInputsLevel2, us-gaap:CertificatesOfDeposit


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value790000.0790000.0705000.0705000.0435000.0434000.0433000.0432000.0
Percentage of CashAndCashEquivalentsFairValueDisclosure37.037.033.033.18.58.58.56.1

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerAssetNet


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2309000.02205000.01795000.01717000.01873000.01758000.01498000.01633000.0
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNet us-gaap:ProductOrService

gwrs:Wastewaterandrecycledwater


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1013000.01030000.0930000.0926000.0834000.0820000.0815000.0838000.0
Percentage of ContractWithCustomerAssetNet43.946.751.853.944.546.654.451.3

gwrs:WaterServices


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1296000.01175000.0865000.0791000.01039000.0938000.0683000.0795000.0
Percentage of ContractWithCustomerAssetNet56.153.348.246.155.553.445.648.7

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiability


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1818181717171717
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiability us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

us-gaap:RegulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.6950.6560.6220.5870.510.440.4770.34
Percentage of ContractWithCustomerLiability3.83.63.43.32.92.52.71.9

us-gaap:UnregulatedOperation


None
Period End2020-09-302020-06-302020-03-312019-12-312019-03-312018-12-31
Value0.010.0160.0220.01717
Percentage of ContractWithCustomerLiability0.10.10.10.097.398.1

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent


None
Period End2020-06-302020-03-312019-12-31
Value686767
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0

us-gaap:ContributionsInAidOfConstruction

us-gaap:ContributionsInAidOfConstruction


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value14141414141110104.34.3394.3764.4254.4334.4574.5064.5854.6744.3214.3684.426
Percentage of ContributionsInAidOfConstruction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContributionsInAidOfConstruction us-gaap:BusinessAcquisition

gwrs:RedRockUtilities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.0073970.0073970.0073977.3970.0073970.0073976.0-6.0
Percentage of ContributionsInAidOfConstruction0.10.10.150.90.10.156.6-56.2

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentCarryingAmount

gwrs:A2017WIFALoan, gwrs:NotesAndBondsPayable


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0.00.00.0150.0150.0150.0160.0120.0120.0
Percentage of DebtInstrumentCarryingAmount0.00.0100.0100.0100.0100.0100.0100.00.0

gwrs:HarquahalaLoan, gwrs:NotesAndBondsPayable


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0.00.00.0030.0040.0060.0080.0090.0110.0120.0130.0150.0
Percentage of DebtInstrumentCarryingAmount0.00.020.026.740.050.075.091.70.00.00.00.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType

gwrs:NotesAndBondsPayable


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value115115115115115115115115115115115115115
Percentage of DebtInstrumentCarryingAmount0.00.00.0766786.7766793.3766806.7718900.0958833.3958858.30.00.00.00.0

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet


None
Period End2020-09-302019-12-31
Value57000.049000.0
Percentage of DebtIssuanceCostsLineOfCreditArrangementsNet100.0100.0

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility


None
Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-31
Value27000.049000.072000.095000.0137000.0117000.0137000.020000.0
Percentage of DebtIssuanceCostsLineOfCreditArrangementsNet0.0100.00.00.00.00.00.00.0

us-gaap:DeferredCompensationLiabilityCurrent

us-gaap:DeferredCompensationLiabilityCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1284000.01211000.01118000.02008000.01710000.02093000.02332000.02305000.02252000.02048000.01666000.02171000.02006000.01985000.01704000.01920000.01368000.01453000.0842000.0598000.0
Percentage of DeferredCompensationLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:LongtermDebtType

us-gaap:DeferredFinanceCostsNet

us-gaap:SecuredDebt


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value571000.0582000.0593000.0605000.0615000.0600000.0638000.0649000.0660000.0672000.0693000.0
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredRevenue

us-gaap:DeferredRevenue


None
Period End2020-09-302020-06-302020-03-312019-12-31
Value0.010.0160.0220.0
Percentage of DeferredRevenue100.0100.0100.00.0

us-gaap:DeferredRevenueNoncurrent

us-gaap:DeferredRevenueNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value17171717171717171719191919191919191919
Percentage of DeferredRevenueNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:AwardType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302016-12-312016-06-302016-03-31
Value153000.0217000.0288000.0172000.0219000.0227000.0186000.0193000.0187000.0125000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302016-12-312016-06-302016-03-31
Value9000.023000.038000.046000.059000.0159000.0300000.0909000.01104000.0428000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths5.910.613.226.726.970.0161.3471.0590.4342.4

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:AwardType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312017-09-30
Value0000050000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive0.00.00.00.00.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:AwardType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value32000.030000.020000.036000.031000.030000.08000.06000.05000.048000.067000.00
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:AwardType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-30
Value80000.076000.076000.0129000.0110000.0106000.0000073000.075000.066000.093000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0

us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-30
Value38000.046000.050000.091000.078000.078000.098000.074000.067000.064000.0186000.0125000.093000.0687000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree47.560.565.870.570.973.60.00.00.00.0254.8166.7140.9738.7

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:AwardType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:PhantomShareUnitsPSUs


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value195000.0185000.0184000.0253000.0215000.0264000.0107000.099000.091000.070000.0184000.0190000.0167000.0106000.0170000.0102000.068000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockAppreciationRightsSARS


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value38000.046000.050000.091000.078000.078000.0120000.091000.082000.0192000.0863000.0853000.0652000.0692000.0953000.0749000.0322000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo19.524.927.236.036.329.5112.191.990.1274.3469.0448.9390.4652.8560.6734.3473.5

us-gaap:EquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestments

gwrs:FATHOM


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312013-06-05
Value000009000.079000.0124000.0185000.0234000.0345000.0375000.0475000.0602000.0480000.0821000.01600000.0
Percentage of EquityMethodInvestments0.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueNetAssetLiability

us-gaap:FairValueNetAssetLiability


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value133129126125129123120118118116
Percentage of FairValueNetAssetLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueNetAssetLiability us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value130126123122123115112108110116
Percentage of FairValueNetAssetLiability97.897.797.797.695.493.593.391.593.2100.0

us-gaap:FairValueInputsLevel3


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value0.8380.8380.8380.8380.0
Percentage of FairValueNetAssetLiability0.60.60.70.70.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1514141414141414141414141414141414141414
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

gwrs:AcquiredInfrastructureCoordinationAndFinancingAgreements


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1312121212121212121212121212121212121212
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization87.086.586.386.386.385.985.985.985.985.985.985.985.985.985.985.985.985.985.985.9

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value2727272727272727262626262626262626262626
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1778000.0476000.01780000.0475000.01778000.0476000.01780000.0478000.01770000.0463000.01771000.0468000.01769000.0467000.01772000.0483000.01662000.0385000.02603000.0877000.0
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:RevolvingCreditFacility


None
Period End2020-04-302018-04-20
Value10000000.08000000.0
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


None
Period End2020-05-04
Value10000000.0
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity0.0

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value118000.0119000.0119000.0117000.087000.078000.075000.047000.046000.039000.029000.08000.08000.09000.07000.025000.0138000.0143000.02031000.01994000.0
Percentage of LongTermDebtAndCapitalLeaseObligationsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtFairValue


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value128124121121122115111107109111112115115113110108116115120116
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtFairValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value128124121121122115111107109115
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


None
Period End2020-09-30
Value101
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


None
Period End2020-09-30
Value2000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


None
Period End2020-09-30
Value3833000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


None
Period End2020-09-30
Value3833000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


None
Period End2020-09-30
Value3833000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


None
Period End2020-09-30
Value1920000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:NontradeReceivablesCurrent

us-gaap:NontradeReceivablesCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-31
Value286000.0339000.0265000.00
Percentage of NontradeReceivablesCurrent100.0100.0100.00.0

us-gaap:OtherAssetsMiscellaneousNoncurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value9000.09000.022000.017000.020000.023000.01000.020000.040000.059000.037000.020000.00
Percentage of OtherAssetsMiscellaneousNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PrepaidExpenseCurrentAndNoncurrent us-gaap:BusinessAcquisition

us-gaap:PrepaidExpenseCurrentAndNoncurrent

gwrs:RedRockUtilities


None
Period End2020-09-30
Value12.0
Percentage of PrepaidExpenseCurrentAndNoncurrent100.0

us-gaap:RegulatoryAssets

us-gaap:RegulatoryAssets


None
Period End2020-09-302020-06-302020-03-312019-12-31
Value1970000.01676000.01696000.01715000.0
Percentage of RegulatoryAssets100.0100.0100.0100.0

us-gaap:RegulatoryLiabilities us-gaap:RegulatoryLiability

us-gaap:RegulatoryLiabilities

gwrs:TaxCutsandJobsAct


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-31
Value700000.0600000.0600000.0600000.0600000.0600000.0600000.0600000.0600000.0600000.0600000.0
Percentage of RegulatoryLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatoryLiabilityNoncurrent

us-gaap:RegulatoryLiabilityNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-01-01
Value8.3318.6868.8458.8038.7438.9748.9168.8519.38.88.4638.4637.8597.8597.8597.8597.8597.8597.8597.85911
Percentage of RegulatoryLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatoryLiabilityNoncurrent us-gaap:PublicUtilitiesRegulatoryProceeding

gwrs:InfrastructureCoordinationAndFinancingAgreements


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-03-312014-12-312014-09-302014-03-31
Value7.07.47.67.97.67.97.97.97.97.97.97.97.97.97.9
Percentage of RegulatoryLiabilityNoncurrent84.085.285.989.786.988.088.689.384.989.893.30.00.00.00.0

gwrs:TaxCutsandJobsAct


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-30
Value1.31.31.21.11.1
Percentage of RegulatoryLiabilityNoncurrent15.615.013.612.612.3

us-gaap:RelatedPartyTransactionDueFromToRelatedParty

us-gaap:RelatedPartyTransactionDueFromToRelatedParty


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value00426000.0519000.0510000.0384000.0406000.0489000.0404000.0463000.0430000.0494000.0388000.0333000.0
Percentage of RelatedPartyTransactionDueFromToRelatedParty0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalents us-gaap:FairValueByAssetClass

us-gaap:RestrictedCashAndCashEquivalents

gwrs:HookUpFeeFunds


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1526000.01133000.01018000.0627000.0611000.047000.09000.09000.09000.0
Percentage of RestrictedCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CertificatesOfDeposit


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value790000.0790000.0705000.0705000.0435000.0434000.0433000.0432000.0431000.0
Percentage of RestrictedCashAndCashEquivalents51.869.769.3112.471.2923.44811.14800.00.0

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value2315000.01923000.01723000.01582000.01046000.0482000.0442000.0441000.0502000.0484000.0499000.0436000.0440000.0231000.0230000.0228000.0263000.09042000.0
Percentage of RestrictedCashAndCashEquivalentsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RoyaltyGuaranteesCommitmentsAmount us-gaap:Range, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RoyaltyGuaranteesCommitmentsAmount

srt:Maximum, gwrs:GlobalWaterManagement


None
Period End2020-09-30
Value15
Percentage of RoyaltyGuaranteesCommitmentsAmount100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardDate, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

gwrs:Q12016, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.00.00.00.00.00.0058050.0087080.011610.0145130.0174150.0203180.02322260.029025
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

gwrs:Q12017, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.0037850.0056780.0075710.0113560.0132490.0151410.0170340.0189270.0208190.022712
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.00.0195.6152.1130.4117.4108.7102.597.8

gwrs:Q12018, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.0077270.0103020.0154540.0180290.0206050.0257560.0283310.030907
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.00.0443.7325.3266.2

gwrs:Q12019, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0187780.021460.0268250.0295080.03219
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.00.0

gwrs:Q12020, us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-31
Value0.0206080.022481
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:PhantomShareUnitsPSUs


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.0471130.0542430.0460640.0532150.0603660.0429170.0502880.0576580.0339490.0411470.0483440.055541380.044182
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.00.0739.3577.5496.6233.9236.3237.9239.2147.4152.2

us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.248250.248250.290750.4370.5240.5240.6190.6190.6360.68150.57850.62850.62850.67750.00.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.00.09026.77108.45331.64382.33913.32847.22706.72.42334.20.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:TitleOfIndividual, us-gaap:AwardDate, us-gaap:AwardType

gwrs:MembersOfManagement, gwrs:Q12015, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-09-302019-06-30
Value0.1180.1180.1180.178
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.0

gwrs:MembersOfManagement, gwrs:Q12018, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-09-302019-06-30
Value0.024750.024750.024750.033
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.0

gwrs:MembersOfManagement, gwrs:Q22020, us-gaap:RestrictedStock


None
Period End2020-06-30
Value0.128327
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.0

gwrs:MembersOfManagement, gwrs:Q32017, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-09-302019-06-30
Value0.0630.0630.0630.103
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.0

srt:ExecutiveOfficer, gwrs:Q22015, us-gaap:StockAppreciationRightsSARS


None
Period End2020-06-302020-03-312019-09-302019-06-30
Value0.04250.04250.0850.123
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber


None
Period End2020-06-302019-06-30
Value128330.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber100.00.0

us-gaap:TaxesPayableCurrentAndNoncurrent us-gaap:BusinessAcquisition

us-gaap:TaxesPayableCurrentAndNoncurrent

gwrs:RedRockUtilities


None
Period End2020-09-30
Value14.0
Percentage of TaxesPayableCurrentAndNoncurrent100.0

us-gaap:TreasuryStockShares

us-gaap:TreasuryStockShares


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value99039.099039.099039.097636.097636.059174.0-59174.0-59174.0-20673.00
Percentage of TreasuryStockShares100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

Line plots across dimensions of each concept


TTM Greenblatt ROC
_
(None,)
None
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:MajorCustomers, us-gaap:ProductOrService
(None, 'gwrs:WaterServices')
None
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
(None, 'us-gaap:UnregulatedOperation')
None
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
(None,)
None
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
None
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
None
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:BusinessAcquisition
(None,)
None
us-gaap:Goodwill
us-gaap:BusinessAcquisition
(None,)
None
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
(None,)
None
us-gaap:LongTermDebtCurrent
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
(None, 'gwrs:NotesAndBondsPayable')
None
us-gaap:AccountsPayableCurrent
us-gaap:BusinessAcquisition
(None,)
None
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
None
us-gaap:ShareBasedCompensation
us-gaap:AwardType, us-gaap:PlanName
('us-gaap:EmployeeStockOption', None)
None