Name:	us-gaap_PublicUtilitiesRateMattersAbstract
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Amount of public utility's requested rate increase (decrease) with regulatory agency.

No definition available.

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount agreed to be returned to ratepayers for effects of the Tax Cuts and Jobs Act of 2017, or the 2017 Tax Act, as a reconcilable negative surcharge to bills generated from March 2019 through February 2020.

No definition available.

Name:	yorw_AmountAgreedToBeReturnedToRatepayersForEffectsOf2017TaxAct
Namespace Prefix:	yorw_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Percentage of the distribution system improvement charge (DSIC) over the base rate. The DSIC allows the Company to add a charge to customers' bills for qualified replacement costs of certain infrastructure without submitting a rate filing as permitted by the regulatory agency.

No definition available.

Name:	yorw_DistributionSystemImprovementChargePercentageOverBaseRate
Namespace Prefix:	yorw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount of the distribution system improvement charge (DSIC) revenue. The DSIC allows the Company to add a charge to customers' bills for qualified replacement costs of certain infrastructure without submitting a rate filing as permitted by the regulatory agency.

No definition available.

Name:	yorw_DistributionSystemImprovementChargeRevenue
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The amount of reconcilable negative surcharges returned to ratepayers for effects of the Tax Cuts and Jobs Act of 2017, or the 2017 Tax Act, on bills generated during the period.

No definition available.

Name:	yorw_NegativeSurchargesReturnedToRatepayersForEffectsOf2017TaxAct
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Data Type:	xbrli:monetaryItemType
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Amount reclassified from the regulatory liability for Excess accumulated deferred income taxes on accelerated depreciation to the regulatory liability for Revenue reduction for Tax Rate change.

No definition available.

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Namespace Prefix:	yorw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Increase (decrease) in revenue recorded as a regulatory liability for the difference in calculated current federal income taxes and deferred federal income taxes on accelerated depreciation associated with the Tax Cuts and Jobs Act of 2017, or the 2017 Tax Act.

No definition available.

Name:	yorw_RevenueRecordedAsRegulatoryLiabilityForEffectsOf2017TaxAct
Namespace Prefix:	yorw_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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Namespace Prefix:
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Namespace Prefix:
Data Type:	na
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Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=yorw_DistributionSystemImprovementChargeMember
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Name:	srt_RangeAxis=srt_MaximumMember
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