Inventories (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Components of inventories
Raw materials	$ 1,450,875	$ 1,514,928
Work in process	2,276,087	1,441,231
Finished goods	2,358,334	1,492,488
Inventory, Gross, Total	6,085,296	4,448,647
Less: reserve for obsolete inventory	(173,785)	(172,557)
Inventory net, Total	$ 5,911,511	$ 4,276,090