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Income Taxes (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Taxes          
Recognition of excess tax benefit $ 20,000 $ 12,000 $ 139,000 $ 104,000  
CALIFORNIA          
Income Taxes          
Reserve for uncertain tax positions 83,000   83,000   $ 83,000
Amount of unrecognized tax benefits decrease in next 12 months $ 0   $ 0