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Income Taxes (Details 3) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Balance at the beginning of the period $ 554,000 $ 528,000
Decreases due to current year positions 0 (2,000)
Increases due to interest 27,000 28,000
Balance at the end of the period $ 581,000 $ 554,000