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Earnings Per Share and Capital Stock 2 (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Capital stock |  |  |
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  | $ (175,000) | $ (129,000)
Additional disclosure |  |  |
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 | 1,800 | 30,998 | 32,142
Cash proceeds from the exercise of stock options | $ 30,000 | $ 519,000 | $ 546,000
Proceeds from Stock Options Exercised, Distributed to Subsidiaries | 0 | 0 | 0
Exercise of stock options and other issuance of Common Shares | $ 30,000 | $ 519,000 | $ 546,000
2000 and 2008 Employee Plans |  |  |
Additional disclosure |  |  |
Exercise of stock options and other issuance of Common Shares | 42,489 | 88,772 | 44,906
AWR |  |  |
Additional disclosure |  |  |
Cash proceeds from the exercise of stock options | $ 30,000 | $ 519,000 | $ 546,000
GSWC |  |  |
Additional disclosure |  |  |
Exercise of stock options and other issuance of Common Shares | $ 60,000,000 |  | $ 47,500,000
Common Stock [Member] |  |  |
Additional disclosure |  |  |
Exercise of stock options and other issuance of Common Shares | 42,000 | 89,000 | 77,000
Exercise of stock options and other issuance of Common Shares | $ 30,000 | $ 519,000 | $ 546,000
Common Stock [Member] | GSWC |  |  |
Additional disclosure |  |  |
Exercise of stock options and other issuance of Common Shares | 5 | 0 | 19
Exercise of stock options and other issuance of Common Shares | $ 60,000,000 |  | $ 47,500,000

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