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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
Income Tax Disclosure [Abstract]        
Income tax expense $ 98,000 $ 98,000 $ 138,000 $ 125,000
Changes in net deferred taxes     $ 0