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Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Performance Obligation, Payment Terms | 20 days |  |
Cost of services | $ 62,411 | $ 55,673 | $ 53,906
GSWC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Period within which Expected Additional Revenue Collection is Recorded Subject to Undercollection of Revenue | 24 months |  |
Contracted services: | American States Utility Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |  |
Sales [Member] | Water: | GSWC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total revenues | 90.00% |  |
Sales [Member] | Electric: | Golden State Water Company and Bear Valley Electric Service, Inc. [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total revenues | 90.00% |  |
Franchisor | GSWC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services | $ 3,800 | $ 4,000 | $ 3,600

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