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Completion of Electric Utility Reorganization Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Oct. 30, 2020
Completion of Electric Utility Reorganization Plan[Line Items]        
Gain (loss) on asset transfer $ 0      
Electric   $ 11,539 $ 10,968  
Net income   19,268 14,072  
Net cash provided from operating activities   24,676 15,654  
Net cash used in investing activities   (36,980) (33,377)  
Net cash provided from financing activities (1)   (17,482) 16,818  
Incremental expansion of borrowing capacity       $ 30,000
Bear Valley Electric Service, Inc.        
Completion of Electric Utility Reorganization Plan[Line Items]        
Net assets transferred $ 71,300      
Bear Valley Electric Service, Inc.        
Completion of Electric Utility Reorganization Plan[Line Items]        
Debt instrument term 3 years      
Maximum borrowing capacity on line of credit $ 35,000      
Outstanding borrowings   22,000    
Incremental expansion of borrowing capacity   15,000    
Taxes Payable $ 0      
Bear Valley Electric Service, Inc. | Electric Service Utility Operations        
Completion of Electric Utility Reorganization Plan[Line Items]        
Electric   11,539    
Operating expenses   8,091    
Operating income   3,448    
Net income   2,523    
Net cash provided from operating activities   2,803    
Net cash used in investing activities   (4,782)    
Net cash provided from financing activities (1)   1,795    
Net change in cash and cash equivalents   (184)    
Cash and cash equivalents, beginning of period   367    
Cash and cash equivalents, end of period   183    
Golden State Water Company        
Completion of Electric Utility Reorganization Plan[Line Items]        
Electric   0 10,968  
Net income   12,231 11,202  
Net cash provided from operating activities   22,799 17,943  
Net cash used in investing activities   (43,715) (31,892)  
Net cash provided from financing activities (1)   $ (12,210) 13,979  
Golden State Water Company | Electric Service Utility Operations        
Completion of Electric Utility Reorganization Plan[Line Items]        
Electric     10,968  
Operating expenses     7,482  
Operating income     3,486  
Net income     $ 2,346