XML 57 R47.htm IDEA: XBRL DOCUMENT
v3.23.3

REGULATORY ASSETS (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Amortization period of other regulatory expense [Abstract] |  |
Deferred contract costs and other | 5 years |
Rate case studies | 5 years |
Deferred costs affiliated interest agreement | 20 years |
Goodwill | 50 years |
Deferred acquisition costs | 20 years |
Franchise costs | 80 years |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | $ 7,265 | $ 7,274
Maximum [Member] |  |
Amortization period of other regulatory expense [Abstract] |  |
Debt related cost | 30 years |
Minimum [Member] |  |
Amortization period of other regulatory expense [Abstract] |  |
Debt related cost | 15 years |
Delaware [Member] |  |
Amortization period of other regulatory expense [Abstract] |  |
Regulatory rate proceedings | 2 years 6 months |
Maryland [Member] |  |
Amortization period of other regulatory expense [Abstract] |  |
Regulatory rate proceedings | 5 years |
Deferred Contract Costs and Other [Member] |  |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | $ 221 | 227
Rate Case Studies [Member] |  |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | 138 | 57
Rate Proceedings [Member] |  |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | 222 | 0
Deferred Income Taxes [Member] |  |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | 449 | 465
Debt Related Costs [Member] |  |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | 4,416 | 4,682
Deferred Costs Affiliated Interest Agreement [Member] |  |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | 1,124 | 1,114
Goodwill [Member] |  |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | 260 | 266
Deferred Acquisition and Franchise Costs [Member] |  |
Regulatory assets net of amortization, comprise [Abstract] |  |
Regulatory assets, net | $ 435 | $ 463

X
- Definition Period over which regulatory noncurrent assets for goodwill is amortized on a straight-line basis. + References No definition available. + Details
Name: | artna_AmortizationPeriodGoodwill
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents amortization period of debt related cost. + References No definition available. + Details
Name: | artna_AmortizationPeriodOfDebtRelatedCost
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which regulatory noncurrent asset for deferred acquisition costs amortized. + References No definition available. + Details
Name: | artna_AmortizationPeriodOfDeferredAcquisitionCosts
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents amortization period of deferred contract costs and other. + References No definition available. + Details
Name: | artna_AmortizationPeriodOfDeferredContractCostsAndOther
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortization period of deferred costs affiliated interest agreement. + References No definition available. + Details
Name: | artna_AmortizationPeriodOfDeferredCostsAffiliatedInterestAgreement
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which regulatory noncurrent asset for deferred franchise costs amortized. + References No definition available. + Details
Name: | artna_AmortizationPeriodOfDeferredFranchiseCosts
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Description of the amortization period for recovery of the individual regulatory noncurrent assets related to other expenses in a schedule of regulatory noncurrent assets. + References No definition available. + Details
Name: | artna_AmortizationPeriodOfRegulatoryRateProceedingsAndApplications
Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
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_StatementGeographicalAxis=stpr_MD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=artna_DeferredContractCostsAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=artna_ExpenseOfRateCaseStudiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=artna_RateProceedingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=artna_DebtRelatedCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=artna_DeferredCostsAffiliatedInterestAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_GoodwillMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=artna_DeferredAcquisitionAndFranchiseCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |