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REGULATORY PROCEEDINGS - Eligible Plant Improvements (Details) - USD ($) $ in Millions | Jan. 01, 2025 | Jul. 01, 2024 | Dec. 18, 2024
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REGULATORY PROCEEDINGS [Abstract] |  |  |
Cumulative DSIC Rate |  | 0.34% | 1.66%
Net Eligible Plant Improvements - Cumulative Dollars | $ 11.7 | $ 2.0 |

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- Definition Increase amount based on eligible plant improvements since the last rate increase. + References No definition available. + Details
Name: | artna_IncreaseAmountBasedOnEligiblePlantImprovementsSinceLastRateIncrease
Namespace Prefix: | artna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage of Distribution System Improvement Charge rate increase application filed by company to regulatory. + References No definition available. + Details
Name: | artna_PercentageOfDistributionSystemImprovementChargeRateIncreaseApplicationFiledByCompanyToRegulatory
Namespace Prefix: | artna_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RegulatedOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration