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Inventories (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Inventories [Abstract]    
Raw materials $ 757,857 $ 482,836
Work in progress 2,338,342 1,254,490
Finished goods 2,156,646 6,929,388
Inventories $ 5,252,845 $ 8,666,714