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Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Property and Equipment (Textual)          
Depreciation expense $ 688,000 $ 760,000 $ 1,344,000 $ 1,455,000  
Accumulated depreciation $ 6,304,000   $ 6,304,000   $ 5,396,000