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Organization, Use of Estimates and Basis of Presentation (Tables)
3 Months Ended
Jul. 31, 2012
Accounting Policies [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 July 31, 2012 and 2011 that could have an effect on the future computation of dilution per common share:

 

    Three Months Ended July 31,  
    2012     2011  
             
Stock options     15,103,955       14,515,948  
Warrants     1,416,667       1,897,017  
Restricted stock     12,500       50,000  
                 
Total common stock equivalents     16,533,122       16,462,965