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Summary of Significant Accounting Policies: (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) registrant customer	Mar. 31, 2021 USD ($)	Apr. 28, 2022 USD ($)	Apr. 22, 2022 USD ($)	Feb. 02, 2022 USD ($)	Jan. 26, 2022 USD ($)	Dec. 31, 2021 USD ($)
Basis of Presentation [Abstract]
Number of registrants filing combined report | registrant	2
Nature of Operations:
Number of customers | customer	1,000,000
Number of States in which Entity Operates	9
Parent Company | Syndicated Revolving Credit Facility member
Related Party Transactions
Notes Payable, Noncurrent	$ 189,500,000
ASUS
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	$ 1,600,000	$ 1,500,000
ASUS | Contracted Services
Nature of Operations:
Period of fixed price contracts to operate and maintain water systems at various military bases	50 years
BVESI
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	$ 794,000	$ 799,000
Maximum borrowing capacity on line of credit							$ 35,000,000
Incremental expansion of borrowing capacity	15,000,000
Outstanding borrowings	32,000,000
COVID-19 Impact [Line Items]
Regulatory asset-CEMA	$ 576,000
Approval amount for the relief funds					$ 321,000
BVESI | Unsecured Private Placement Notes | Subsequent Event
Related Party Transactions
Debt Instrument, Face Amount			$ 35,000,000
BVESI | Senior A Notes Due 2032 | Subsequent Event
Related Party Transactions
Debt Instrument, Interest Rate, Stated Percentage			4.548%
Debt Instrument, Face Amount			$ 17,500,000
BVESI | Senior B Notes Due 2037 | Subsequent Event
Related Party Transactions
Debt Instrument, Interest Rate, Stated Percentage			4.949%
Debt Instrument, Face Amount			$ 17,500,000
BVESI | Electric Service Utility Operations
Nature of Operations:
Number of customers | customer	24,700
Golden State Water Company
Related Party Transactions
Related Party Transaction, Terms and Manner of Settlement	24
COVID-19 Impact [Line Items]
Approval amount for the relief funds						$ 9,500,000
Golden State Water Company | Water Service Utility Operations
Nature of Operations:
Number of customers | customer	262,900
Golden State Water Company and Bear Valley Electric Service Inc.
COVID-19 Impact [Line Items]
Regulatory asset-CEMA	$ 4,500,000
Maximum | Parent Company | Revolving Credit Facility | Subsequent Event
Related Party Transactions
Line of Credit Facility, Current Borrowing Capacity				$ 280,000,000
Minimum | Parent Company | Revolving Credit Facility | Subsequent Event
Related Party Transactions
Line of Credit Facility, Current Borrowing Capacity				$ 200,000,000

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