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Inventories (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Inventory    
Raw materials and work in process $ 2,979,291 $ 2,810,711
Consigned inventory 249,676 277,324
Finished goods 2,325,357 2,283,694
Total $ 5,554,324 $ 5,371,729