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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