Inventories (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Components of inventories
Raw materials	$ 2,893,278	$ 1,627,784
Work-in-process	3,631,881	1,778,650
Finished goods	1,571,008	1,509,606
Inventory gross	8,096,167	4,916,040
Less: reserve for obsolete inventory	(181,154)	(182,482)
Inventory net	$ 7,915,013	$ 4,733,558