XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.25.3

REGULATORY PROCEEDINGS (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 03, 2025 USD ($) | Jun. 12, 2024 USD ($) | Sep. 30, 2025 USD ($) Application | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Application | Sep. 30, 2024 USD ($) | Apr. 04, 2025 USD ($) | Dec. 18, 2024 | Jul. 01, 2024 | Nov. 28, 2023 USD ($) | Apr. 28, 2023 USD ($)
REGULATORY PROCEEDINGS [Abstract] |  |  |  |  |  |  |  |  |  |  |
Annual revenue performance obligation (in Dollars) |  | $ 11.2 |  |  |  |  | $ 10.8 |  |  | $ 10.8 | $ 16.7
Percentage of revenue increase requested for new rates | 2.88% | 15.20% |  |  |  |  | 12.41% |  |  | 14.60% | 22.70%
Percentage of distribution system infrastructure charge |  |  |  |  |  |  | 1.66% |  |  | 7.50% |
Percentage of return on common equity |  | 9.50% |  |  |  |  |  |  |  |  |
Overall rate of return on rate base |  | 6.75% |  |  |  |  |  |  |  |  |
Incremental increase in rate |  |  |  |  |  |  | 10.75% |  |  |  |
Additional revenue from temporary incremental increase in rates (in Dollars) | $ 2.5 |  |  |  |  |  |  |  |  |  |
Percentage of temporary incremental increase in rate | 1.22% |  |  |  |  |  |  |  |  |  |
Number of applications (in Application) | Application |  |  | 2 |  | 2 |  |  |  |  |  |
Cumulative DSIC Rate |  |  |  |  |  |  |  | 1.66% | 0.34% |  |
Artesian Water [Member] |  |  |  |  |  |  |  |  |  |  |
REGULATORY PROCEEDINGS [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue earned in DSIC rate increases (in Dollars) |  |  | $ 0.0 | $ 0.1 | $ 0.5 | $ 0.1 |  |  |  |  |
Delaware [Member] |  |  |  |  |  |  |  |  |  |  |
REGULATORY PROCEEDINGS [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of gross water sales |  |  |  |  | 15.00% |  |  |  |  |  |
Period to complete rate case by law |  |  |  |  | 7 months |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
REGULATORY PROCEEDINGS [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of gross water sales in temporary rate increase placed into effect until new rates approved | 0.00% |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Delaware [Member] |  |  |  |  |  |  |  |  |  |  |
REGULATORY PROCEEDINGS [Abstract] |  |  |  |  |  |  |  |  |  |  |
Temporary annual rate increase subject to 15% gross water sales limitation (in Dollars) |  |  |  |  | $ 2.5 |  |  |  |  |  |
Percentage of rate relief allowed should a rate case not complete |  |  |  |  | 15.00% |  |  |  |  |  |
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% |  |  |  |  |  |

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

X
- Definition Percentage of annual gross water sales in temporary rate increase placed into effect until new rates approved. + References No definition available. + Details
Name: | artna_PercentageOfGrossWaterSalesInTemporaryRateIncreasePlacedIntoEffectUntilNewRatesApproved
Namespace Prefix: | artna_
Data Type: | dtr: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: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: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: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: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: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
- Definition Line items represent regulatory proceedings. + References No definition available. + Details
Name: | artna_RegulatoryProceedingsLineItems
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
- Details
Name: | dei_LegalEntityAxis=artna_ArtesianWaterMember
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: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |