Quarterly report pursuant to Section 13 or 15(d)

Inventories (Tables)

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Inventories (Tables)
3 Months Ended
Jul. 31, 2013
Inventory Disclosure [Abstract]  
Inventories
    July 31,
2013
  April 30,
2013
Raw materials   $ 1,573,732     $ 1,425,386  
Work in process     63,475       88,603  
Finished goods     1,084,956       1,389,065  
    $ 2,722,163     $ 2,903,054