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Inventories (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Inventories [Abstract]    
Raw materials $ 1,455,516 $ 1,675,383
Work in progress 1,373,975 2,737,415
Finished goods 6,386,132 5,209,563
Inventories $ 9,215,623 $ 9,622,361