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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