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Inventories (Tables)
3 Months Ended
Oct. 31, 2013
Inventory Disclosure [Abstract]  
Inventories
   October 31,
2013
   April 30,
2013
 
Raw materials  $1,207,336   $1,425,386 
Work in process   206,433    88,603 
Finished goods   767,974    1,389,065 
   $2,181,743   $2,903,054