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5. INVENTORIES (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Materials $ 1,238,332 $ 911,054
Work in process 84,203 10,284
Finished goods 15,182,305 6,519,012
Total inventories $ 16,504,840 $ 7,440,350