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Summary of Significant Accounting Policies: (Details)		3 Months Ended		9 Months Ended
	May 24, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) customer registrant	Sep. 30, 2020 USD ($)	Oct. 30, 2020 USD ($)	Jul. 01, 2020 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		9
Related Party Transactions
Incremental expansion of borrowing capacity						$ 30,000,000
Parent Company [Member] | Syndicated Revolving Credit Facility member [Member]
Related Party Transactions
Notes Payable, Noncurrent		$ 162,000,000		$ 162,000,000
ASUS
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs		1,200,000	$ 1,200,000	$ 4,000,000	$ 3,800,000
ASUS | Contracted Services
Nature of Operations:
Period of fixed price contracts to operate and maintain water systems at various military bases				50 years
Bear Valley Electric Service, Inc.
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs		653,000	$ 643,000	$ 2,100,000	$ 2,200,000
Maximum borrowing capacity on line of credit							$ 35,000,000
Incremental expansion of borrowing capacity		15,000,000		15,000,000
Outstanding borrowings		28,000,000		28,000,000
COVID-19 Impact [Line Items]
Funding for overdue electric bills per Budget Act of 2021		1,000,000,000		$ 1,000,000,000
Bear Valley Electric Service, Inc. | Electric Service Utility Operations
Nature of Operations:
Number of customers | customer				24,600
Golden State Water Company
Related Party Transactions
Related Party Transaction, Terms and Manner of Settlement				24
Debt Instrument, Interest Rate, Stated Percentage	9.56%
Debt Instrument, Face Amount	$ 28,000,000
Debt Instrument Redemption Premium as Percentage of Par Value after Specified Period	3.00%
Redemption price of debt instrument	$ 840,000
Notes Payable, Related Parties		0		$ 0
COVID-19 Impact [Line Items]
Water Utility Relief Funding for Overdue Water Bills per Budget Act of 2021 [Line Items]		1,000,000,000		$ 1,000,000,000
Golden State Water Company | Water Service Utility Operations
Nature of Operations:
Number of customers | customer				262,500
Golden State Water Company and Bear Valley Electric Service Inc.
COVID-19 Impact [Line Items]
Regulatory asset-CEMA		8,500,000		$ 8,500,000
Maximum [Member] | Parent Company [Member] | Revolving Credit Facility [Member]
Related Party Transactions
Line of Credit Facility, Current Borrowing Capacity		$ 200,000,000		$ 200,000,000

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