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Inventories (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Inventories [Abstract]    
Raw materials $ 542,413 $ 482,836
Work in progress 1,042,250 1,254,490
Finished goods 3,774,913 6,929,388
Inventories $ 5,359,576 $ 8,666,714