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Inventories (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Inventories    
Raw materials $ 1,731,599 $ 1,438,471
Work-in-progress 406,683 355,208
Finished goods 1,570,450 1,319,856
Reduction to LIFO cost (1,162,423) (1,127,363)
Total inventories $ 2,546,309 $ 1,986,172