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Income Taxes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) Position	Dec. 31, 2023 USD ($)	Dec. 31, 2017	Dec. 31, 2014 USD ($)
Provisions for Income Taxes [Abstract]
Federal current	$ 728	$ 506
State current	147	241
Federal deferred	409	540
State deferred	102	25
Federal investment tax credit, net of current utilization	(36)	(35)
Total income taxes	1,350	1,277
Reconciliation of Statutory Federal Tax Provision to Total Provision [Abstract]
Statutory Federal tax provision	4,552	5,257
State income taxes, net of Federal benefit	244	287
IRS TPR deduction	(3,315)	(4,029)
Tax-exempt interest	(33)	(40)
Amortization of investment tax credit	(36)	(35)
Cash value of life insurance	(19)	5
Amortization of excess accumulated deferred income taxes on accelerated depreciation	(196)	(197)
Change in enacted state tax rate	21	(9)
Other, net	132	38
Total income taxes	1,350	1,277
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 44,811	$ 43,633
Federal corporate tax rate	21.00%	21.00%	34.00%
Deferred Tax Assets [Abstract]
Reserve for doubtful accounts	$ 440	$ 278
Compensated absences	178	186
Deferred compensation	998	1,073
Excess accumulated deferred income taxes on accelerated depreciation	3,280	3,335
Deferred taxes associated with the gross-up of revenues necessary to return, in rates, the effect of temporary differences	1,622	1,623
Customers' advances for construction and contributions in aid of construction	1,032	1,117
Tax effect of pension regulatory liability	5,693	5,286
Tax loss carryover	71	168
Contribution carryover	16	113
Other costs deducted for book, not for tax	50	62
Total deferred tax assets	13,380	13,241
Deferred Tax Liabilities [Abstract]
Accelerated depreciation	30,069	29,298
Basis differences from IRS TPR	26,787	23,182
Investment tax credit	265	290
Deferred taxes associated with the gross-up of revenues necessary to recover, in rates, the effect of temporary differences	10,208	8,965
Pensions	6,237	5,831
Unamortized debt issuance costs	333	363
Other costs deducted for tax, not for book	638	547
Total deferred tax liabilities	74,537	68,476
Net deferred tax liability	61,157	55,235
Tax Credit Carryovers [Abstract]
Valuation allowance	0	0
Uncertain tax positions	$ 0
Open tax years	2021 2022 2023
Number of new tax positions taken | Position	0
Interest or penalties	$ 0	0
Contribution Carryovers [Member]
Tax Credit Carryovers [Abstract]
Tax credit carryover	$ 58
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	$ 2,376	2,635		$ 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	(3,056)	$ (3,770)
Pennsylvania [Member]
Tax Loss Carryovers [Abstract]
Tax loss carryover	$ 1,118
Expiration date	Dec. 31, 2042

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