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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