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Inventories (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Inventories [Abstract]    
Raw materials $ 598,039 $ 482,836
Work in progress 1,718,101 1,254,490
Finished goods 5,113,489 6,929,388
Inventories $ 7,429,629 $ 8,666,714