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Inventories (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Inventories    
Raw materials $ 5,392,759 $ 5,425,773
Work in process 1,009,529 1,513,794
Finished goods 2,616,984 2,819,056
Total inventory $ 9,019,272 $ 9,758,623