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Income Taxes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Position	Dec. 31, 2021 USD ($)	Dec. 31, 2017	Dec. 31, 2014 USD ($)
Provisions for Income Taxes [Abstract]
Federal current	$ 11	$ 710
State current	0	246
Federal deferred	370	311
State deferred	(331)	(109)
Federal investment tax credit, net of current utilization	(35)	(38)
Total income taxes	15	1,120
Reconciliation of Statutory Federal Tax Provision to Total Provision [Abstract]
Statutory Federal tax provision	4,115	3,802
State income taxes, net of Federal benefit	(196)	177
IRS TPR deduction	(3,675)	(2,620)
Tax-exempt interest	(41)	(34)
Amortization of investment tax credit	(35)	(38)
Cash value of life insurance	13	(17)
Amortization of excess accumulated deferred income taxes on accelerated depreciation	(160)	(182)
Change in enacted state tax rate	3	0
Other, net	(9)	32
Total income taxes	15	1,120
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 38,041	$ 36,981
Federal corporate tax rate	21.00%	21.00%	34.00%
Deferred Tax Assets [Abstract]
Reserve for doubtful accounts	$ 240	$ 247
Compensated absences	172	176
Deferred compensation	1,052	1,376
Excess accumulated deferred income taxes on accelerated depreciation	3,385	3,942
Deferred taxes associated with the gross-up of revenues necessary to return, in rates, the effect of temporary differences	1,700	2,348
Customers' advances for construction and contributions in aid of construction	1,260	1,545
Tax effect of pension regulatory liability	3,717	3,429
Tax loss carryover	839	0
Contribution carryover	140	0
Other costs deducted for book, not for tax	58	74
Total deferred tax assets	12,563	13,137
Deferred Tax Liabilities [Abstract]
Accelerated depreciation	28,772	30,953
Basis differences from IRS TPR	18,713	16,912
Investment tax credit	316	329
Deferred taxes associated with the gross-up of revenues necessary to recover, in rates, the effect of temporary differences	7,439	9,553
Pensions	4,262	4,060
Unamortized debt issuance costs	393	469
Other costs deducted for tax, not for book	569	451
Total deferred tax liabilities	60,464	62,727
Net deferred tax liability	47,901	49,590
Tax Credit Carryovers [Abstract]
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	2019
Latest Tax Year [Member]
Income Taxes [Abstract]
Open tax year	2021
Contribution Carryovers [Member]
Tax Credit Carryovers [Abstract]
Tax credit carryover	$ 499
Contribution Carryovers [Member] | Earliest Tax Year [Member]
Tax Credit Carryovers [Abstract]
Expiration date	Dec. 31, 2026
Contribution Carryovers [Member] | Latest Tax Year [Member]
Tax Credit Carryovers [Abstract]
Expiration date	Dec. 31, 2027
IRS TPR Catch-Up Deduction [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 2,894	3,153		$ 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	(3,416)	$ (2,361)
Federal [Member]
Tax Loss Carryovers [Abstract]
Tax loss carryover	2,739
Pennsylvania [Member]
Tax Loss Carryovers [Abstract]
Tax loss carryover	$ 3,716
Expiration date	Dec. 31, 2042

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