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Significant Accounting Policies, Regulatory Assets and Liabilities (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) ServiceLine | Dec. 31, 2021 USD ($) | Dec. 31, 2014 USD ($)
Assets [Abstract] |  |  |
Regulatory assets | $ 42,545 | $ 45,280 |
Liabilities [Abstract] |  |  |
Regulatory liabilities | 38,041 | 36,981 |
Excess Accumulated Deferred Income Taxes on Accelerated Depreciation [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | 13,483 | 13,644 |
Postretirement Benefits [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | 14,906 | 11,870 |
Income Taxes [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | $ 6,758 | 8,314 |
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 | $ 2,894 | 3,153 | $ 3,887
Remaining recovery period | 11 years |  |
Approved amortization period | 15 years |  |
Income Taxes [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 29,779 | 33,255 |
Unrealized Swap Losses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 674 | 2,054 |
Unrealized Swap Losses [Member] | Minimum [Member] |  |  |
Assets [Abstract] |  |  |
Remaining recovery period | 1 year |  |
Unrealized Swap Losses [Member] | Maximum [Member] |  |  |
Assets [Abstract] |  |  |
Remaining recovery period | 7 years |  |
Utility Plant Retirement Costs [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 9,060 | 7,245 |
Remaining recovery period | 5 years |  |
Customer-Owned Lead Service Line Replacements [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 1,260 | 1,161 |
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 | $ 1,353 | 1,545 |
Service Life Study Expenses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 24 | 3 |
Remaining recovery period | 5 years |  |
Rate Case Filing Expenses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 395 | $ 17 |
Remaining recovery period | 4 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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