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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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