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Significant Accounting Policies, Regulatory Assets and Liabilities (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) ServiceLine | Dec. 31, 2022 USD ($) | Dec. 31, 2014 USD ($)
Assets [Abstract] |  |  |
Regulatory assets | $ 48,949 | $ 42,545 |
Liabilities [Abstract] |  |  |
Regulatory liabilities | 43,633 | 38,041 |
Excess Accumulated Deferred Income Taxes on Accelerated Depreciation [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | 13,286 | 13,483 |
Postretirement Benefits [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | 21,196 | 14,906 |
Income Taxes [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | $ 6,516 | 6,758 |
Income Taxes [Member] | Minimum [Member] |  |  |
Liabilities [Abstract] |  |  |
Remaining recovery period | 1 year |  |
Income Taxes [Member] | Maximum [Member] |  |  |
Liabilities [Abstract] |  |  |
Remaining recovery period | 50 years |  |
IRS TPR Catch-Up Deduction [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | $ 2,635 | 2,894 | $ 3,887
Remaining recovery period | 10 years |  |
Approved amortization period | 15 years |  |
Income Taxes [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 35,885 | 29,779 |
Unrealized Swap Losses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 632 | 674 |
Unrealized Swap Losses [Member] | Minimum [Member] |  |  |
Assets [Abstract] |  |  |
Remaining recovery period | 1 year |  |
Unrealized Swap Losses [Member] | Maximum [Member] |  |  |
Assets [Abstract] |  |  |
Remaining recovery period | 6 years |  |
Utility Plant Retirement Costs [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 9,592 | 9,060 |
Remaining recovery period | 5 years |  |
Customer-Owned Lead Service Line Replacements [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 1,257 | 1,260 |
Remaining recovery period | 4 years |  |
Number of lead customer-owned service lines to be replaced annually | ServiceLine | 400 |  |
Term of tariff modification to replace customer-owned lead service lines | 9 years |  |
Income Taxes on Customers' Advances for Construction and Contributions in Aid of Construction [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 1,250 | 1,353 |
Service Life Study Expenses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 19 | 24 |
Remaining recovery period | 4 years |  |
Rate Case Filing Expenses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 314 | $ 395 |
Remaining recovery period | 3 years |  |

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481854/980-405-25-1 + Details
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