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Inventories (Tables)
9 Months Ended
Oct. 31, 2012
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]

Inventories consist of the following:

 

    October 31,     January 31,  
    2012     2012  
Raw materials   $ 17,333,438     $ 21,213,423  
Work-in-process     1,773,586       1,790,510  
Finished goods     22,130,271       22,664,422  
    $ 41,237,295     $ 45,668,355