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Summary of Significant Accounting Policies: (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
state
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
state
customer
registrant
Jun. 30, 2021
USD ($)
Apr. 28, 2022
USD ($)
Apr. 22, 2022
USD ($)
Dec. 31, 2021
USD ($)
Summary of significant accounting policies              
Number of customers | customer     1,000,000        
Number of States in which Entity Operates | state 9   9        
Number of registrants filing combined report | registrant     2        
Parent Company | Syndicated Revolving Credit Facility member [Member]              
Summary of significant accounting policies              
Notes Payable, Noncurrent $ 223,500,000   $ 223,500,000        
ASUS              
Summary of significant accounting policies              
Payments to affiliate for corporate office administrative and general costs 1,100,000 $ 1,300,000 2,700,000 $ 2,800,000      
BVESI              
Summary of significant accounting policies              
Payments to affiliate for corporate office administrative and general costs 592,000 $ 679,000 1,400,000 $ 1,500,000      
Maximum borrowing capacity on line of credit 35,000,000   35,000,000        
Incremental expansion of borrowing capacity 15,000,000   $ 15,000,000        
Debt instrument term     24 months        
BVESI | Syndicated Revolving Credit Facility member [Member]              
Summary of significant accounting policies              
Notes Payable, Noncurrent 0   $ 0        
BVESI | Unsecured Private Placement Notes              
Summary of significant accounting policies              
Debt Instrument, Face Amount         $ 35,000,000    
BVESI | Senior Notes Due 2032              
Summary of significant accounting policies              
Debt Instrument, Face Amount         $ 17,500,000    
Debt Instrument, Interest Rate, Stated Percentage         4.548%    
BVESI | Senior Notes Due 2037              
Summary of significant accounting policies              
Debt Instrument, Face Amount         $ 17,500,000    
Debt Instrument, Interest Rate, Stated Percentage         4.949%    
BVESI | Electric:              
Summary of significant accounting policies              
Number of customers | customer     24,700        
GSWC              
Summary of significant accounting policies              
Intercompany payable to Parent $ 102,399,000   $ 102,399,000       $ 0
GSWC | Water:              
Summary of significant accounting policies              
Number of customers | customer     263,000        
Maximum | Parent Company | Revolving Credit Facility              
Summary of significant accounting policies              
Line of Credit Facility, Current Borrowing Capacity           $ 280,000,000  
Minimum | Parent Company | Revolving Credit Facility              
Summary of significant accounting policies              
Line of Credit Facility, Current Borrowing Capacity           $ 200,000,000