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Summary of Significant Accounting Policies: (Details) |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 08, 2020 USD ($) Rate | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) registrant customer | Sep. 30, 2019 USD ($) | Jul. 15, 2020 USD ($) | Jul. 01, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Increase to provision |  | $ 871,000 |  | $ 1,937,000 |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  | 1,000,000 |  |  |  |  |
Number of States in which Entity Operates |  | 9 |  | 9 |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Number of registrants filing combined report | registrant |  |  |  | 2 |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Notes payable to bank |  | $ 92,000,000 |  | $ 92,000,000 |  |  |  |  | $ 200,000,000
Ratio of Indebtedness to EBITDA |  | 8.00 |  | 8.00 |  |  |  |  |
Ratio of Indebtedness to Net Capital | 0.6667 |  |  |  |  |  |  |  |
Note Payable 2.17 Percent Due 2030 [Member] |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.17% |  |  |  |  |  |  |  |
Note Payable 2.9 Percent Due 2040 [Member] |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.90% |  |  |  |  |  |  |  |
Parent Company [Member] | Syndicated Revolving Credit Facility member [Member] |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  |  |  |  |  |  | $ 35,000,000.0 |
Related Party Transactions |  |  |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  |  |  |  |  |  | 35,000,000.0 |
Notes Payable, Noncurrent |  | $ 89,000,000.0 |  | $ 89,000,000.0 |  |  |  |  |
ASUS |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Payments to affiliate for corporate office administrative and general costs |  | 1,200,000 | $ 1,200,000 | 3,800,000 | $ 3,500,000 |  |  |  |
Payments to affiliate for corporate office administrative and general costs |  | $ 1,200,000 | $ 1,200,000 | $ 3,800,000 | $ 3,500,000 |  |  |  |
ASUS | Contracted Services |  |  |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases |  |  |  | 50 years |  |  |  |  |
Bear Valley Electric Service, Inc. |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  |  |  |  |  | $ 15,000,000 |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Payments to affiliate for corporate office administrative and general costs |  |  |  | $ 643,000 |  |  |  |  |
Maximum borrowing capacity on line of credit |  |  |  |  |  |  | 35,000,000 |  |
Debt instrument term |  | 3 years |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  |  |  |  |  | $ 15,000,000 |  |
Payments to affiliate for corporate office administrative and general costs |  |  |  | $ 643,000 |  |  |  |  |
Bear Valley Electric Service, Inc. | Electric Service Utility Operations |  |  |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  | 24,500 |  |  |  |  |
Golden State Water Company |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Increase to provision |  | $ 801,000 |  | $ 1,867,000 |  |  |  |  |
Regulatory asset-CEMA |  | 1,400,000 |  | $ 1,400,000 |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Related Party Transaction, Terms and Manner of Settlement |  |  |  | 24 |  |  |  |  |
Due to Related Parties |  | $ 34,100,000 |  | $ 34,100,000 |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | Rate | 0.50% |  |  |  |  |  |  |  |
Golden State Water Company | Private Placement [Member] |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 160.0 |  |  |  |  |  |  |  |
Golden State Water Company | Note Payable 2.17 Percent Due 2030 [Member] |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 85,000,000.0 |  |  |  |  |  |  |  |
Golden State Water Company | Note Payable 2.9 Percent Due 2040 [Member] |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 75,000,000.0 |  |  |  |  |  |  |  |
Golden State Water Company | Water Service Utility Operations |  |  |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  | 261,500 |  |  |  |  |
Maximum [Member] | Parent Company [Member] | Syndicated Revolving Credit Facility member [Member] |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  |  |  |  |  |  | 260.0 |
Related Party Transactions |  |  |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  |  |  |  |  |  | $ 260.0 |
Minimum [Member] | Parent Company [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  | $ 200,000,000.0 |  |  |

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