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Rate Matters (Details) - PPUC [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Rate Matters [Abstract] |  |
Amount agreed to be returned to customers for effects of 2017 Tax Act | $ 2,117 |
Revenue recorded as regulatory liability for effects of 2017 Tax Act | (1) | $ (325)
Reclassification from excess accumulated deferred income taxes on accelerated depreciation | 0 | (27)
Negative surcharges returned to customers for effects of 2017 Tax Act | 2,117 |
Rate Request Filed on May 30, 2018 [Member] | Water [Member] |  |
Rate Matters [Abstract] |  |
Requested increase in annual revenue | 6,399 |
Authorized dollar increase in annual revenues from the PPUC | 3,361 |
Rate Request Filed on May 30, 2018 [Member] | Wastewater [Member] |  |
Rate Matters [Abstract] |  |
Requested increase in annual revenue | 289 |
Authorized dollar increase in annual revenues from the PPUC | 289 |
DSIC [Member] |  |
Rate Matters [Abstract] |  |
Distribution system improvement charge revenue | $ 0 | $ 249
DSIC [Member] | Maximum [Member] |  |
Rate Matters [Abstract] |  |
Distribution system improvement charge percentage over base rate | 5.00% |
DSIC [Member] | Minimum [Member] |  |
Rate Matters [Abstract] |  |
Distribution system improvement charge percentage over base rate | 0.00% |

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- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
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- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
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- Definition Amount agreed to be returned to ratepayers for effects of the Tax Cuts and Jobs Act of 2017, or the 2017 Tax Act, as a reconcilable negative surcharge to bills generated from March 2019 through February 2020. + References No definition available. + Details
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- Definition Percentage of the distribution system improvement charge (DSIC) over the base rate. The DSIC allows the Company to add a charge to customers' bills for qualified replacement costs of certain infrastructure without submitting a rate filing as permitted by the regulatory agency. + References No definition available. + Details
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- Definition Amount of the distribution system improvement charge (DSIC) revenue. The DSIC allows the Company to add a charge to customers' bills for qualified replacement costs of certain infrastructure without submitting a rate filing as permitted by the regulatory agency. + References No definition available. + Details
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- Definition The amount of reconcilable negative surcharges returned to ratepayers for effects of the Tax Cuts and Jobs Act of 2017, or the 2017 Tax Act, on bills generated during the period. + References No definition available. + Details
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- Definition Increase (decrease) in revenue recorded as a regulatory liability for the difference in calculated current federal income taxes and deferred federal income taxes on accelerated depreciation associated with the Tax Cuts and Jobs Act of 2017, or the 2017 Tax Act. + References No definition available. + Details
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