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Inventories, Change in Accounting Estimates and Inventory Adjustments (Details) (USD $)
Oct. 31, 2013
Jan. 31, 2013
Raw materials $ 17,059,057 $ 16,361,872
Work-in-process 1,640,632 1,812,788
Finished goods 21,740,598 21,096,015
Inventory, Net, Total $ 40,440,287 $ 39,270,675