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Inventories (Details) (USD $)
Sep. 30, 2012
Sep. 30, 2011
Inventories    
Raw materials $ 1,301,145 $ 1,548,095
Work-in-process 3,251,644 3,598,623
Finished goods 5,330,862 6,131,976
Inventories, net $ 9,883,651 $ 11,278,694