Inventories (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Components of inventories
Raw materials	$ 2,359,528	$ 1,627,784
Work-in-process	3,267,325	1,778,650
Finished goods	2,210,300	1,509,606
Inventory gross	7,837,153	4,916,040
Less: reserve for obsolete inventory	(181,207)	(182,482)
Inventory net	$ 7,655,946	$ 4,733,558