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Earnings Per Share and Capital Stock 2 (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Capital stock |  |  |
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  | $ (129,000) | $ (176,000)
Additional disclosure |  |  |
Common Shares issued under DRP and the Employee Plans | 88,772 | 44,906 | 56,498
Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance | 1,055,948 |  |
Common Shares authorized for issuance but unissued under 401(k) Plan | 387,300 |  |
Common Shares issued as a result of the exercise of stock options | 30,998 | 32,142 | 52,936
Cash proceeds from the exercise of stock options | $ 519,000 | $ 546,000 | $ 909,000
Proceeds from Stock Options Exercised, Distributed to Subsidiaries | 0 | 0 | 0
AWR |  |  |
Additional disclosure |  |  |
Cash proceeds from the exercise of stock options | $ 519,000 | 546,000 | $ 909,000
GSWC |  |  |
Additional disclosure |  |  |
Stock Issued During Period, Value, New Issues |  | $ 47,500,000 |
Common Stock [Member] |  |  |
Additional disclosure |  |  |
Common Shares issued under DRP and the Employee Plans | 89,000 | 77,000 | 110,000
Common Stock [Member] | GSWC |  |  |
Additional disclosure |  |  |
Common Shares issued under DRP and the Employee Plans |  | 19 |

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