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Earnings Per Share and Capital Stock 2 (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Capital stock |  |  |
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  | $ (176,000) | $ (145,000)
Additional disclosure |  |  |
Common Shares issued under DRP and the Employee Plans | 44,906 | 56,498 | 56,900
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 | 32,142 | 52,936 | 12,546
Proceeds from Stock Options Exercised, Distributed to Subsidiaries | $ 0 | $ 0 | $ 0
GSWC |  |  |
Additional disclosure |  |  |
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans | $ 47,500,000 |  |
Common Stock [Member] |  |  |
Additional disclosure |  |  |
Common Shares issued under DRP and the Employee Plans | 77,000 | 110,000 | 69,000
Common Stock [Member] | GSWC |  |  |
Additional disclosure |  |  |
Common Shares issued under DRP and the Employee Plans | 19 |  |

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