Amount of additional revenue from temporary incremental increase in rates.

No definition available.

Name:	artna_AdditionalRevenueFromTemporaryIncreaseInRates
Namespace Prefix:	artna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

- 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

- 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

- 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

- 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

- 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

- References

No definition available.

+ Details

Name:	artna_OtherProceedingsAbstract
Namespace Prefix:	artna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- References

No definition available.

+ Details

Name:	artna_RateProceedingsAbstract
Namespace Prefix:	artna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- 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

- Details

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

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=stpr_DE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=artna_ArtesianWaterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

REGULATORY PROCEEDINGS (Details) $ in Millions					3 Months Ended
REGULATORY PROCEEDINGS (Details) $ in Millions	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