XML 62 R51.htm IDEA: XBRL DOCUMENT
v3.25.1

REGULATORY PROCEEDINGS (Details) $ in Millions |  |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 04, 2025 USD ($) | Jan. 01, 2025 USD ($) | Jul. 01, 2024 USD ($) | Jun. 12, 2024 USD ($) | Mar. 31, 2025 USD ($) Application | Dec. 18, 2024 | Nov. 28, 2023 USD ($) | Apr. 28, 2023 USD ($)
Rate Proceedings [Abstract] |  |  |  |  |  |  |  |
Percentage of revenue increase requested for new rates |  |  |  | 15.20% |  |  | 14.60% | 22.70%
Annual revenue performance obligation |  |  |  | $ 11.2 |  |  | $ 10.8 | $ 16.7
Percentage of distribution system infrastructure charge |  |  |  |  |  |  | 7.50% |
Percentage of return on common equity |  |  |  | 9.50% |  |  |  |
Overall rate of return on rate base |  |  |  | 6.75% |  |  |  |
Term after application is filed |  |  |  |  | 60 days |  |  |
Percentage of temporary incremental increase in rate | 1.22% |  |  |  |  |  |  |
Additional revenue from temporary incremental increase in rates | $ 1.2 |  |  |  |  |  |  |
Other Proceedings [Abstract] |  |  |  |  |  |  |  |
Number of applications | Application |  |  |  |  | 2 |  |  |
Cumulative DSIC Rate |  |  | 0.34% |  |  | 1.66% |  |
Net Eligible Plant Improvements - Cumulative Dollars |  | $ 11.7 | $ 2.0 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Rate Proceedings [Abstract] |  |  |  |  |  |  |  |
Percentage of revenue increase requested for new rates | 12.41% |  |  |  |  |  |  |
Annual revenue performance obligation | $ 10.8 |  |  |  |  |  |  |
Percentage of distribution system infrastructure charge | 1.66% |  |  |  |  |  |  |
Incremental increase in rate | 10.75% |  |  |  |  |  |  |
Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Rate Proceedings [Abstract] |  |  |  |  |  |  |  |
Temporary annual rate increase subject to 15% gross water sales limitation | $ 2.5 |  |  |  |  |  |  |
Percentage of gross water sales | 15.00% |  |  |  |  |  |  |
Delaware [Member] |  |  |  |  |  |  |  |
Rate Proceedings [Abstract] |  |  |  |  |  |  |  |
Percentage of gross water sales |  |  |  |  | 15.00% |  |  |
Period to complete rate case by law |  |  |  |  | 7 months |  |  |
Delaware [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Rate Proceedings [Abstract] |  |  |  |  |  |  |  |
Temporary annual rate increase subject to 15% gross water sales limitation |  |  |  |  | $ 2.5 |  |  |
Percentage of rate relief allowed should a rate case not complete |  |  |  |  | 15.00% |  |  |
Other Proceedings [Abstract] |  |  |  |  |  |  |  |
Distribution System Improvement Charge rate increase applied between base rate filings |  |  |  |  | 7.50% |  |  |
Distribution System Improvement Charge rate increase within a 12-month period |  |  |  |  | 5.00% |  |  |
Artesian Water [Member] |  |  |  |  |  |  |  |
Other Proceedings [Abstract] |  |  |  |  |  |  |  |
Revenue earned in DSIC rate increases |  |  |  |  | $ 0.3 |  |  |

X
- Definition Amount of additional revenue from temporary incremental increase in rates. + References No definition available. + Details
Name: | artna_AdditionalRevenueFromTemporaryIncreaseInRates
Namespace Prefix: | artna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For a first temporary increase in revenue basis, maximum temporary annual rate charge increase subject to specific gross water sales limitation. + References No definition available. + Details
Name: | artna_AmountOfTemporaryRateIncreasePerRateSettingProcess
Namespace Prefix: | artna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Ceiling percentage of Distribution System Improvement Charge rate subject to amount billed to customers. + References No definition available. + Details
Name: | artna_DistributionSystemImprovementChargeRateCeilingPercentage
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Conditional percentage maximum for increasing Distribution System Improvement Charge rate within a 12-month period. + References No definition available. + Details
Name: | artna_DistributionSystemImprovementChargeRateConditionalIncrease
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition The amount of increase in rate a customer would experience after the DSIC rate is subtracted from the new actual rate. + References No definition available. + Details
Name: | artna_IncrementalIncreaseInRate
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of applications for Distribution System Improvement Charge rate increase application filed by company to regulatory. + References No definition available. + Details
Name: | artna_NumberOfApplications
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | artna_OtherProceedingsAbstract
Namespace Prefix: | artna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For a filing request with a regulatory agency to implement new rates, the percentage of rate of return on base rate upon rate approval. + References No definition available. + Details
Name: | artna_OverallRateOfReturnOnRateBase
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Artesian Water has been permitted to recover specific percentage of investments made in infrastructure. + References No definition available. + Details
Name: | artna_PercentageOfDistributionSystemInfrastructureCharge
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition For a first temporary annual rate increase in revenue basis, maximum percentage of gross water sales increase allowed subject to specific dollar amount limitation. + References No definition available. + Details
Name: | artna_PercentageOfGrossWaterSalesMaximumTemporaryAnnualRateIncreaseSubjectToCeilingLimitation
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of relief that utility may put into effect if condition for rate case period completion not fulfilled by law. + References No definition available. + Details
Name: | artna_PercentageOfReliefIfRateCasePeriodConditionNotFulfill
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition For a filing request with a regulatory agency to implement new rates, the percentage of return on common equity upon rate approval. + References No definition available. + Details
Name: | artna_PercentageOfReturnOnCommonEquity
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition For a filing request with a regulatory agency to implement new rates, the percentage increase in annual revenue expected upon rate approval. + References No definition available. + Details
Name: | artna_PercentageOfRevenueIncreaseRequestedForNewRates
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of temporary incremental increase in rate that can be charged. + References No definition available. + Details
Name: | artna_PercentageOfTemporaryIncrementalIncreaseInRate
Namespace Prefix: | artna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period within which rate change case is to complete, by law, after which, entire requested rate relief may go into effect. + References No definition available. + Details
Name: | artna_PeriodToCompleteRateChangeApplicationCaseByLaw
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | artna_RateProceedingsAbstract
Namespace Prefix: | artna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue earned due to Distribution System Improvement Charge rate increase. + References No definition available. + Details
Name: | artna_RevenueEarnedInDistributionSystemImprovementCharge
Namespace Prefix: | artna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transaction price allocated to performance obligation that has been recognized as revenue. + References No definition available. + Details
Name: | artna_RevenuePerformanceObligation
Namespace Prefix: | artna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of days after the application is filed in which the company is permitted to place into effect temporary rates. + References No definition available. + Details
Name: | artna_TermAfterApplicationIsFiled
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_DE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=artna_ArtesianWaterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |