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Income Taxes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Position	Dec. 31, 2022 USD ($)	Dec. 31, 2017	Dec. 31, 2014 USD ($)
Provisions for Income Taxes [Abstract]
Federal current	$ 506	$ 11
State current	241	0
Federal deferred	540	370
State deferred	25	(331)
Federal investment tax credit, net of current utilization	(35)	(35)
Total income taxes	1,277	15
Reconciliation of Statutory Federal Tax Provision to Total Provision [Abstract]
Statutory Federal tax provision	5,257	4,115
State income taxes, net of Federal benefit	287	(196)
IRS TPR deduction	(4,029)	(3,675)
Tax-exempt interest	(40)	(41)
Amortization of investment tax credit	(35)	(35)
Cash value of life insurance	5	13
Amortization of excess accumulated deferred income taxes on accelerated depreciation	(197)	(160)
Change in enacted state tax rate	(9)	3
Other, net	38	(9)
Total income taxes	1,277	15
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 43,633	$ 38,041
Federal corporate tax rate	21.00%	21.00%	34.00%
Deferred Tax Assets [Abstract]
Reserve for doubtful accounts	$ 278	$ 240
Compensated absences	186	172
Deferred compensation	1,073	1,052
Excess accumulated deferred income taxes on accelerated depreciation	3,335	3,385
Deferred taxes associated with the gross-up of revenues necessary to return, in rates, the effect of temporary differences	1,623	1,700
Customers' advances for construction and contributions in aid of construction	1,117	1,260
Tax effect of pension regulatory liability	5,286	3,717
Tax loss carryover	168	839
Contribution carryover	113	140
Other costs deducted for book, not for tax	62	58
Total deferred tax assets	13,241	12,563
Deferred Tax Liabilities [Abstract]
Accelerated depreciation	29,298	28,772
Basis differences from IRS TPR	23,182	18,713
Investment tax credit	290	316
Deferred taxes associated with the gross-up of revenues necessary to recover, in rates, the effect of temporary differences	8,965	7,439
Pensions	5,831	4,262
Unamortized debt issuance costs	363	393
Other costs deducted for tax, not for book	547	569
Total deferred tax liabilities	68,476	60,464
Net deferred tax liability	55,235	47,901
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	2020
Latest Tax Year [Member]
Income Taxes [Abstract]
Open tax year	2022
Contribution Carryovers [Member]
Tax Credit Carryovers [Abstract]
Tax credit carryover	$ 408
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	$ 2,635	2,894		$ 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	(3,770)	$ (3,416)
Pennsylvania [Member]
Tax Loss Carryovers [Abstract]
Tax loss carryover	$ 2,499
Expiration date	Dec. 31, 2042

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