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Inventories (Schedule of Inventories) (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and work in process $ 16,223,162 $ 19,345,723
Consigned inventory 128,005 416,468
Finished goods, net of reserve 5,943,732 4,664,055
Total inventories 22,294,899 24,426,246
less non-current inventories (11,656,742) (15,554,992)
Total inventories $ 10,638,157 $ 8,871,254