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INVENTORIES, NET (Details) (USD $)
Jan. 31, 2015
Jan. 31, 2014
Inventory [Line Items]    
Raw materials $ 15,624,059us-gaap_InventoryRawMaterialsNetOfReserves $ 16,348,861us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 2,162,664us-gaap_InventoryWorkInProcessNetOfReserves 1,292,741us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 22,521,552us-gaap_InventoryFinishedGoodsNetOfReserves 22,202,707us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, Net, Total $ 40,308,275us-gaap_InventoryNet $ 39,844,309us-gaap_InventoryNet