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Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property and Equipment (Textual)          
Depreciation expense $ 760,000 $ 722,000 $ 1,455,000 $ 1,444,000  
Accumulated depreciation $ 5,396,000   $ 5,396,000   $ 4,827,000