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Inventories (Schedule of Inventories) (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Inventories [Abstract]    
Finished goods $ 6,776,000 $ 6,728,000
Raw and processed materials 1,314,000 1,803,000
Inventories $ 8,089,911 $ 8,531,112