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Inventories (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials $ 4,986,000 $ 4,483,000
Work-in-process 140,000 462,000
Finished goods 2,485,000 2,290,000
Total inventory $ 7,610,645 $ 7,235,043