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Inventories - Inventories (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished goods $ 40,287,710 $ 32,899,114
Work in process 67,208 274,158
Materials and supplies 10,349,279 6,087,833
Inventories: $ 50,704,197 $ 39,261,105