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Revenues (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) unit | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Performance Obligation, Payment Terms | 20 days |  |
Cost of services | $ 57,912 | $ 53,171 | $ 56,909
Retroactive water revenues impact as a result of a proposed decision | 30,000 |  |
GSWC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue impact due to lower cost of debt | $ 6,400 |  |
Golden State Water Company and Bear Valley Electric Service, Inc. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Period within which Expected Additional Revenue Collection is Recorded Subject to Undercollection of Revenue | 24 months |  |
Contracted services: | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |  |
Contracted services: | American States Utility Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Number of construction performance obligation | unit | 1 |  |
Contracted services: | American States Utility Services | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |  |
Contracted services: | American States Utility Services | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 15 years |  |
Sales | Water: | GSWC | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total revenues | 90.00% |  |
Sales | Electric: | BVES | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total revenues | 90.00% |  |
Franchisor | Golden State Water Company and Bear Valley Electric Service, Inc. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services | $ 4,900 | $ 4,000 | $ 4,200

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