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Inventories (Details) (USD $)
Oct. 31, 2014
Jan. 31, 2014
Inventory [Line Items]    
Raw materials $ 15,661,684 $ 16,348,861
Work-in-process 1,878,206 1,292,740
Finished goods 21,381,573 22,202,708
Inventory, Net, Total $ 38,921,463 $ 39,844,309