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Inventories (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials $ 1,675,383 $ 1,814,704
Work in progress 2,737,415 2,188,193
Finished goods 5,209,563 5,829,508
Inventories $ 9,622,361 $ 9,832,405