Organization, Use of Estimates and Basis of Presentation (Tables)

3 Months Ended

Jul. 31, 2014

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 July 31, 2014 and 2013 that could have an effect on the future computation of dilution per common share:

	Three Months Ended July 31,
	2014	2013
Stock options	23,382,287	14,161,455
Warrants	3,276,667	3,276,667
Restricted stock	-	25,000
Total common stock equivalents	26,658,954	17,463,122