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Significant Accounting Policies, Regulatory Assets and Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) ServiceLine	Dec. 31, 2021 USD ($)	Dec. 31, 2014 USD ($)
Assets [Abstract]
Regulatory assets	$ 42,545	$ 45,280
Liabilities [Abstract]
Regulatory liabilities	38,041	36,981
Excess Accumulated Deferred Income Taxes on Accelerated Depreciation [Member]
Liabilities [Abstract]
Regulatory liabilities	13,483	13,644
Postretirement Benefits [Member]
Liabilities [Abstract]
Regulatory liabilities	14,906	11,870
Income Taxes [Member]
Liabilities [Abstract]
Regulatory liabilities	$ 6,758	8,314
Income Taxes [Member] | Minimum [Member]
Liabilities [Abstract]
Remaining recovery period	1 year
Income Taxes [Member] | Maximum [Member]
Liabilities [Abstract]
Remaining recovery period	50 years
IRS TPR Catch-Up Deduction [Member]
Liabilities [Abstract]
Regulatory liabilities	$ 2,894	3,153	$ 3,887
Remaining recovery period	11 years
Approved amortization period	15 years
Income Taxes [Member]
Assets [Abstract]
Regulatory assets	$ 29,779	33,255
Unrealized Swap Losses [Member]
Assets [Abstract]
Regulatory assets	$ 674	2,054
Unrealized Swap Losses [Member] | Minimum [Member]
Assets [Abstract]
Remaining recovery period	1 year
Unrealized Swap Losses [Member] | Maximum [Member]
Assets [Abstract]
Remaining recovery period	7 years
Utility Plant Retirement Costs [Member]
Assets [Abstract]
Regulatory assets	$ 9,060	7,245
Remaining recovery period	5 years
Customer-Owned Lead Service Line Replacements [Member]
Assets [Abstract]
Regulatory assets	$ 1,260	1,161
Remaining recovery period	4 years
Number of lead customer-owned service lines to be replaced annually | ServiceLine	400
Term of tariff modification to replace customer-owned lead service lines	9 years
Income Taxes on Customers' Advances for Construction and Contributions in Aid of Construction [Member]
Assets [Abstract]
Regulatory assets	$ 1,353	1,545
Service Life Study Expenses [Member]
Assets [Abstract]
Regulatory assets	$ 24	3
Remaining recovery period	5 years
Rate Case Filing Expenses [Member]
Assets [Abstract]
Regulatory assets	$ 395	$ 17
Remaining recovery period	4 years

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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-SubTopic 340
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Number of lead customer-owned service lines to be replaced annually whenever they are discovered.

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Term of consent order agreement with the Pennsylvania Department of Environmental Protection involving the replacement of lead customer-owned service lines regardless of material used for company-owned service lines, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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