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Significant Accounting Policies, Regulatory Assets and Liabilities (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) ServiceLine | Dec. 31, 2019 USD ($) | Dec. 31, 2014 USD ($)
Assets [Abstract] |  |  |
Regulatory assets | $ 39,893 | $ 34,189 |
Liabilities [Abstract] |  |  |
Regulatory liabilities | 25,969 | 25,399 |
Excess Accumulated Deferred Income Taxes on Accelerated Depreciation [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | 13,826 | 14,008 |
Income Taxes [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | $ 8,706 | 7,494 |
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 | $ 3,412 | 3,671 | $ 3,887
Remaining recovery period | 13 years |  |
Postretirement Benefits [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | $ 25 | 0 |
Revenue Reduction For Tax Rate Change [Member] |  |  |
Liabilities [Abstract] |  |  |
Regulatory liabilities | $ 0 | 226 |
Term for negative surcharge on bills to customers | 1 year |  |
Income Taxes [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 28,200 | 24,405 |
Postretirement Benefits [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | 0 | 365 |
Unrealized Swap Losses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 2,700 | 2,227 |
Unrealized Swap Losses [Member] | Minimum [Member] |  |  |
Assets [Abstract] |  |  |
Remaining recovery period | 1 year |  |
Unrealized Swap Losses [Member] | Maximum [Member] |  |  |
Assets [Abstract] |  |  |
Remaining recovery period | 9 years |  |
Utility Plant Retirement Costs [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 5,968 | 5,012 |
Remaining recovery period | 5 years |  |
Customer-Owned Lead Service Line Replacements [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 1,081 | 944 |
Remaining recovery period | 4 years |  |
Term of tariff modification to replace customer-owned lead service lines connected to company-owned lead service lines | 3 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 | $ 1,815 | 998 |
Service Life Study Expenses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 8 | 13 |
Remaining recovery period | 2 years |  |
Rate Case Filing Expenses [Member] |  |  |
Assets [Abstract] |  |  |
Regulatory assets | $ 121 | $ 225 |
Remaining recovery period | 1 year |  |

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