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Income Taxes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Position	Dec. 31, 2020 USD ($)	Dec. 31, 2017	Dec. 31, 2014 USD ($)
Provisions for Income Taxes [Abstract]
Federal current	$ 710	$ 1,376
State current	246	554
Federal deferred	311	247
State deferred	(109)	(120)
Federal investment tax credit, net of current utilization	(38)	(39)
Total income taxes	1,120	2,018
Reconciliation of Statutory Federal Tax Provision to Total Provision [Abstract]
Statutory Federal tax provision	3,802	3,909
State income taxes, net of Federal benefit	177	426
IRS TPR deduction	(2,620)	(1,979)
Tax-exempt interest	(34)	(29)
Amortization of investment tax credit	(38)	(39)
Cash value of life insurance	(17)	(110)
Amortization of excess accumulated deferred income taxes on accelerated depreciation	(182)	(182)
Other, net	32	22
Total income taxes	1,120	2,018
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 36,981	$ 25,969
Federal corporate tax rate	21.00%	21.00%	34.00%
Deferred Tax Assets [Abstract]
Reserve for doubtful accounts	$ 247	$ 189
Compensated absences	176	151
Deferred compensation	1,376	1,375
Excess accumulated deferred income taxes on accelerated depreciation	3,942	3,995
Deferred taxes associated with the gross-up of revenues necessary to return, in rates, the effect of temporary differences	2,348	2,456
Customers' advances for construction and contributions in aid of construction	1,545	1,815
Tax effect of pension regulatory liability	3,429	7
Other costs deducted for book, not for tax	74	64
Total deferred tax assets	13,137	10,052
Deferred Tax Liabilities [Abstract]
Accelerated depreciation	30,953	29,893
Basis differences from IRS TPR	16,912	13,671
Investment tax credit	329	356
Deferred taxes associated with the gross-up of revenues necessary to recover, in rates, the effect of temporary differences	9,553	8,088
Pensions	4,060	638
Unamortized debt issuance costs	469	500
Other costs deducted for tax, not for book	451	444
Total deferred tax liabilities	62,727	53,590
Net deferred tax liability	49,590	43,538
Valuation allowance	0	0
Uncertain tax positions	$ 0
Income Taxes [Abstract]
Number of new tax positions taken | Position	0
Interest or penalties	$ 0	0
Earliest Tax Year [Member]
Income Taxes [Abstract]
Open tax year	2018
Latest Tax Year [Member]
Income Taxes [Abstract]
Open tax year	2020
IRS TPR Catch-Up Deduction [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 3,153	3,412		$ 3,887
Approved amortization period	15 years
Amortization of catch-up deduction	$ (259)	(259)
IRS TPR Ongoing Deductions [Member]
Regulatory Liabilities [Abstract]
Ongoing TPR deduction	$ (2,361)	$ (1,720)

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Amount recognized for uncertainty in income taxes classified as current.

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Number of new tax positions taken.

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Amortization period approved by regulatory agency for the recovery of regulatory asset or liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amortization of the catch-up deduction during the period related to tax benefits realized on the Company's 2014 income tax return for qualifying capital expenditures made prior to 2014.

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Ongoing deduction recorded during the period related to tax benefits realized on the Company's TPR deductions.

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