Inventories (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Components of inventories
Raw materials	$ 1,475,878	$ 835,589
Work-in-process	1,456,898	1,454,999
Finished goods	1,814,015	2,132,080
Inventory gross	4,746,791	4,422,668
Less: reserve for obsolete inventory	(183,129)	(181,646)
Inventory net	$ 4,563,662	$ 4,241,022