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Organization, Use of Estimates and Basis of Presentation (Tables)
6 Months Ended
Oct. 31, 2012
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, 2012 and 2011 that could have an effect on the future computation of dilution per common share:

 

    October 31,  
    2012     2011  
             
Stock options     14,643,955       14,615,948  
Warrants     1,416,667       1,416,667  
                 
Total common stock equivalents     16,060,622       16,032,615