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Organization, Use of Estimates and Basis of Presentation (Tables)
6 Months Ended
Oct. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
The following table reflects the total potential share-based instruments outstanding at October 31, 2013 and 2012 that could have an effect on the future computation of dilution per common share:
 
 
 
October 31,
 
 
 
2013
 
2012
 
 
 
 
 
 
 
Stock options
 
15,473,955
 
14,643,955
 
Warrants
 
3,276,667
 
1,416,667
 
 
 
 
 
 
 
Total common stock equivalents
 
18,750,622
 
16,060,622