Revenue (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) Municipality	Mar. 31, 2017 USD ($)
Revenue [Abstract]
Revenue from contracts with customers	$ 11,515	$ 11,174
Rents from regulated property	129	116
Operating revenue	$ 11,644	11,290
Utility Service [Member]
Revenue [Abstract]
Number of days for customer to make payment after being invoiced	20 days
Water Utility Service [Member] \| Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 7,318	7,133
Water Utility Service [Member] \| Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	3,134	3,119
Water Utility Service [Member] \| Fire Protection [Member]
Revenue [Abstract]
Revenue from contracts with customers	713	719
Wastewater Utility Service [Member] \| Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	247	141
Wastewater Utility Service [Member] \| Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	61	21
Billing and Revenue Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 16	18
Number of days for customer to make payment after being invoiced	30 days
Number of municipalities within the service territory provided service \| Municipality	4
Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 18	15
Number of days for customer to make payment after being invoiced	30 days
Other Revenue [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 8	$ 8

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

+ Details

Name:	us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTaxAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of municipalities within the service territory of the Company provided service as distinct performance obligations.

+ References

No definition available.

+ Details

Name:	yorw_NumberOfMunicipalitiesWithinTheServiceTerritoryProvidedService
Namespace Prefix:	yorw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between invoice being sent to customer and when payment is due, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	yorw_TermForCustomerToMakePaymentAfterBeingInvoiced
Namespace Prefix:	yorw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ProductOrServiceAxis=yorw_PublicUtilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=yorw_WaterUtilityServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=yorw_ResidentialCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=yorw_CommercialAndIndustrialCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=yorw_FireProtectionCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=yorw_WastewaterUtilityServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=yorw_BillingAndRevenueCollectionServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=yorw_CollectionServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=yorw_ServiceLineProtectionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: