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Revenues (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
unit
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disaggregation of Revenue [Line Items]      
Revenue, Performance Obligation, Payment Terms 20 days    
Cost of services $ 53,171 $ 56,909 $ 62,411
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: | American States Utility Services      
Disaggregation of Revenue [Line Items]      
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases 50 years    
Number of construction performance obligation | unit 1    
Sales | Water: | GSWC | Customer Concentration Risk      
Disaggregation of Revenue [Line Items]      
Percentage of total revenues 90.00%    
Sales | Electric: | Golden State Water Company and Bear Valley Electric Service, Inc. | 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 $ 4,000 $ 4,200 $ 3,800