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Inventories (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Inventory    
Raw materials and work in process $ 3,188,240 $ 2,810,711
Consigned inventory 247,003 277,324
Finished goods 2,422,225 2,283,694
Total $ 5,857,468 $ 5,371,729