Inventories (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Inventories
Raw materials	$ 1,893,515	$ 2,020,151
Work-in-progress	386,843	407,964
Finished goods	1,267,579	1,517,151
Reduction to LIFO cost	(1,269,576)	(1,314,616)
Total inventory	$ 2,278,361	$ 2,630,650