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Inventories (Details) (USD $)
Mar. 31, 2013
Sep. 30, 2012
Inventories    
Raw materials $ 1,612,301 $ 1,301,145
Work-in-process 2,941,313 3,251,644
Finished goods 4,712,058 5,330,862
Inventories, net $ 9,265,672 $ 9,883,651