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INCOME TAXES (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]                      
Net operating income (loss) $ 3,920,000us-gaap_OperatingIncomeLoss $ 5,331,000us-gaap_OperatingIncomeLoss $ 3,649,000us-gaap_OperatingIncomeLoss $ 3,146,000us-gaap_OperatingIncomeLoss $ 3,277,000us-gaap_OperatingIncomeLoss $ 4,324,000us-gaap_OperatingIncomeLoss $ 4,145,000us-gaap_OperatingIncomeLoss $ 2,738,000us-gaap_OperatingIncomeLoss $ 16,046,000us-gaap_OperatingIncomeLoss $ 14,484,000us-gaap_OperatingIncomeLoss $ 15,855,000us-gaap_OperatingIncomeLoss
Income tax receivable 3,068,000us-gaap_IncomeTaxReceivable       455,000us-gaap_IncomeTaxReceivable       3,068,000us-gaap_IncomeTaxReceivable 455,000us-gaap_IncomeTaxReceivable  
Alternative minimum tax (AMT) credit carryforward 5,459,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax       4,643,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax       5,459,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 4,643,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 5,031,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Valuation allowance 65,000us-gaap_DeferredTaxAssetsValuationAllowance       61,000us-gaap_DeferredTaxAssetsValuationAllowance       65,000us-gaap_DeferredTaxAssetsValuationAllowance 61,000us-gaap_DeferredTaxAssetsValuationAllowance 57,000us-gaap_DeferredTaxAssetsValuationAllowance
State income taxes [Abstract]                      
Current                 173,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 526,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 145,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred                 1,231,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 706,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,312,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total state income tax expense                 1,404,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1,232,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1,457,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Federal income taxes [Abstract]                      
Current                 (1,073,000)us-gaap_CurrentFederalTaxExpenseBenefit 1,199,000us-gaap_CurrentFederalTaxExpenseBenefit 1,795,000us-gaap_CurrentFederalTaxExpenseBenefit
Deferred                 6,044,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 3,157,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 3,364,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total federal income tax expense                 4,971,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 4,356,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 5,159,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Reconciliation of effective tax rate [Abstract]                      
Income before federal and state income taxes                 15,881,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 13,890,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 16,460,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income before federal and state income taxes (in hundredths)                 100.00%artna_IncomeBeforeFederalAndStateIncomeTaxesPercentage 100.00%artna_IncomeBeforeFederalAndStateIncomeTaxesPercentage 100.00%artna_IncomeBeforeFederalAndStateIncomeTaxesPercentage
Amount computed at statutory rate                 5,400,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 4,722,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 5,596,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Amount computed at statutory rate (in hundredths)                 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Reconciling Items [Abstract]                      
State income tax-net of federal tax benefit                 918,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 804,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 952,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State income tax-net of federal tax benefit (in hundredths)                 5.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other                 57,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems 62,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems 68,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Other (in hundredths)                 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total income tax expense                 6,375,000us-gaap_IncomeTaxExpenseBenefit 5,588,000us-gaap_IncomeTaxExpenseBenefit 6,616,000us-gaap_IncomeTaxExpenseBenefit
Total effective income tax rate (in hundredths)                 40.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred tax assets related to [Abstract]                      
Alternative minimum tax (AMT) credit carryforward 5,459,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax       4,643,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax       5,459,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 4,643,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 5,031,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Federal and state operating loss carry-forwards 1,045,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards       544,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards       1,045,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 544,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 481,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Bad debt allowance 99,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts       88,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts       99,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 88,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 96,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Valuation allowance (65,000)us-gaap_DeferredTaxAssetsValuationAllowance       (61,000)us-gaap_DeferredTaxAssetsValuationAllowance       (65,000)us-gaap_DeferredTaxAssetsValuationAllowance (61,000)us-gaap_DeferredTaxAssetsValuationAllowance (57,000)us-gaap_DeferredTaxAssetsValuationAllowance
Stock options 397,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost       343,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost       397,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 343,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 294,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other 269,000us-gaap_DeferredTaxAssetsOther       264,000us-gaap_DeferredTaxAssetsOther       269,000us-gaap_DeferredTaxAssetsOther 264,000us-gaap_DeferredTaxAssetsOther 326,000us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 7,204,000us-gaap_DeferredTaxAssetsNet       5,821,000us-gaap_DeferredTaxAssetsNet       7,204,000us-gaap_DeferredTaxAssetsNet 5,821,000us-gaap_DeferredTaxAssetsNet 6,171,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities related to [Abstract]                      
Property plant and equipment basis differences (63,427,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       (55,066,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       (63,427,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (55,066,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (51,687,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Liability for Uncertain Tax Positions, Noncurrent (179,000)us-gaap_LiabilityForUncertainTaxPositionsNoncurrent       0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent       (179,000)us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Expenses of rate proceedings (214,000)artna_DeferredTaxLiabilityExpensesOfRateProceedings       (86,000)artna_DeferredTaxLiabilityExpensesOfRateProceedings       (214,000)artna_DeferredTaxLiabilityExpensesOfRateProceedings (86,000)artna_DeferredTaxLiabilityExpensesOfRateProceedings (53,000)artna_DeferredTaxLiabilityExpensesOfRateProceedings
Property taxes (505,000)artna_DeferredTaxLiabilityPropertyTaxes       (592,000)artna_DeferredTaxLiabilityPropertyTaxes       (505,000)artna_DeferredTaxLiabilityPropertyTaxes (592,000)artna_DeferredTaxLiabilityPropertyTaxes (496,000)artna_DeferredTaxLiabilityPropertyTaxes
Other (734,000)us-gaap_DeferredTaxLiabilitiesOther       (657,000)us-gaap_DeferredTaxLiabilitiesOther       (734,000)us-gaap_DeferredTaxLiabilitiesOther (657,000)us-gaap_DeferredTaxLiabilitiesOther (651,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (65,059,000)us-gaap_DeferredIncomeTaxLiabilities       (56,401,000)us-gaap_DeferredIncomeTaxLiabilities       (65,059,000)us-gaap_DeferredIncomeTaxLiabilities (56,401,000)us-gaap_DeferredIncomeTaxLiabilities (52,887,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability (57,855,000)us-gaap_DeferredTaxAssetsLiabilitiesNet       (50,580,000)us-gaap_DeferredTaxAssetsLiabilitiesNet       (57,855,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (50,580,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (46,716,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred taxes, which are classified into a net current and non-current balance, are presented in the balance sheet as follows [Abstract]                      
Current deferred tax liability (812,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent       (838,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent       (812,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent (838,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent (837,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-current deferred tax liability (57,043,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent       (49,742,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent       (57,043,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (49,742,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (45,879,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net deferred tax liability (57,855,000)us-gaap_DeferredTaxAssetsLiabilitiesNet       (50,580,000)us-gaap_DeferredTaxAssetsLiabilitiesNet       (57,855,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (50,580,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (46,716,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation and Qualifying Accounts Disclosure [Line Items]                      
Balance at Beginning Of Period       61,000us-gaap_ValuationAllowancesAndReservesBalance       57,000us-gaap_ValuationAllowancesAndReservesBalance 61,000us-gaap_ValuationAllowancesAndReservesBalance 57,000us-gaap_ValuationAllowancesAndReservesBalance 53,000us-gaap_ValuationAllowancesAndReservesBalance
Additions Charged to Costs and Expenses                 4,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 4,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 4,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Deductions                 0us-gaap_ValuationAllowancesAndReservesDeductions 0us-gaap_ValuationAllowancesAndReservesDeductions 0us-gaap_ValuationAllowancesAndReservesDeductions
Balance at End of Period 65,000us-gaap_ValuationAllowancesAndReservesBalance       61,000us-gaap_ValuationAllowancesAndReservesBalance       65,000us-gaap_ValuationAllowancesAndReservesBalance 61,000us-gaap_ValuationAllowancesAndReservesBalance 57,000us-gaap_ValuationAllowancesAndReservesBalance
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]                      
Balance at beginning of year       179,000us-gaap_UnrecognizedTaxBenefits         179,000us-gaap_UnrecognizedTaxBenefits    
Balance at end of year 179,000us-gaap_UnrecognizedTaxBenefits       179,000us-gaap_UnrecognizedTaxBenefits       179,000us-gaap_UnrecognizedTaxBenefits 179,000us-gaap_UnrecognizedTaxBenefits  
Minimum [Member]                      
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards Expiration Period                 2024    
Maximum [Member]                      
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards Expiration Period                 2035    
Federal Authorities [Member]                      
Operating Loss Carryforwards [Line Items]                      
Net operating loss carry-forwards 200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		               200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Net operating income (loss)                 6,000,000us-gaap_OperatingIncomeLoss
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Income tax receivable 1,200,000us-gaap_IncomeTaxReceivable
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		               1,200,000us-gaap_IncomeTaxReceivable
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Alternative minimum tax (AMT) credit carryforward 5,500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		               5,500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Alternative minimum tax credit carryforward 800,000artna_DeferredTaxAssetsTaxCreditCarryDeferredTaxAssetsAmtCredit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		               800,000artna_DeferredTaxAssetsTaxCreditCarryDeferredTaxAssetsAmtCredit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Tax deduction for qualifying capital expenditures                 3,300,000us-gaap_IncomeTaxReconciliationDeductions
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		 8,500,000us-gaap_IncomeTaxReconciliationDeductions
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		  
Income tax examination description                 for tax years 2011 through 2014    
Deferred tax assets related to [Abstract]                      
Alternative minimum tax (AMT) credit carryforward 5,500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		               5,500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
State Authorities [Member]                      
Operating Loss Carryforwards [Line Items]                      
Net operating loss carry-forwards $ 17,500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               $ 17,500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Income tax examination description                 for tax years 2011 through 2014