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Property, Plant and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Property, Plant and Equipment (Textual)        
Depreciation expense $ 762,475 $ 819,522 $ 1,535,336 $ 1,647,471