Inventories (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Components of inventories
Raw materials	$ 1,861,015	$ 1,514,928
Work in process	2,363,824	1,441,231
Finished goods	2,169,188	1,492,488
Inventory, Gross, Total	6,394,027	4,448,647
Less: reserve for obsolete inventory	(173,393)	(172,557)
Inventory net, Total	$ 6,220,634	$ 4,276,090