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Financial Information by Geographic Location (Tables)
3 Months Ended
Jul. 31, 2012
Segment Reporting [Abstract]  
Revenue by geographic location
   Three months
ended
July 31,
2012
   Three months
ended
July 31,
2011
 
United States  $5,975,204   $8,694,578 
Europe   1,321,922    1,199,293 
Other (principally Asia Pacific Region)   701,359    375,935 
Consolidated  $7,998,485   $10,269,806