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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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