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Inventories (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Inventories    
Raw materials $ 1,606,841 $ 1,640,098
Work-in-progress 364,879 375,229
Finished goods 1,255,502 1,336,707
Reduction to LIFO cost (1,148,089) (1,232,229)
Total inventories $ 2,079,133 $ 2,119,805