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Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property and Equipment (Textual)          
Depreciation expense $ 722,000 $ 714,000 $ 1,444,000 $ 1,442,000  
Accumulated depreciation $ 4,246,000   $ 4,246,000   $ 3,595,000