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Inventories
3 Months Ended
Apr. 30, 2013
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
4. Inventories

Inventories consist of the following:

 

    April 30, 2013     January 31, 2013  
             
Raw materials   $ 17,048,059     $ 16,361,872  
Work-in-process     1,709,825       1,812,788  
Finished goods     20,333,092       21,096,015  
    $ 39,090,976     $ 39,270,675  

 

Inventories include freight-in, materials, labor and overhead costs and are stated at the lower of cost (on a first-in, first-out basis) or market.