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Subsequent Event (Details) - Note Payable 9.56 Percent Due 2031 - Golden State Water Company - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
May 24, 2021 | Mar. 31, 2021
Subsequent Event [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 9.56%
Debt Instrument, Face Amount |  | $ 28,000
Debt Instrument, Basis Spread on Variable Rate |  | 0.55%
Maximum [Member] |  |
Subsequent Event [Line Items] |  |
Debt Instrument Redemption Premium as Percentage of Par Value after Specified Period |  | 3.00%
Subsequent Event [Member] | Forecast |  |
Subsequent Event [Line Items] |  |
Redemption price of debt instrument | $ 840 |
Debt Instrument Redemption Premium as Percentage of Par Value after Specified Period | 3.00% |

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