Inventories (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Components of inventories
Raw materials	$ 1,448,000	$ 835,589
Work-in-process	1,110,786	1,454,999
Finished goods	1,471,434	2,132,080
Inventory gross	4,030,220	4,422,668
Less: reserve for obsolete inventories	(175,491)	(181,646)
Inventory net	$ 3,854,729	$ 4,241,022