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Inventories (Schedule of Inventories) (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Inventories [Abstract]    
Finished goods $ 6,728,000 $ 7,140,000
Raw and processed materials 1,803,000 4,859,000
Inventories $ 8,531,112 $ 11,998,638