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

3 Months Ended

Jul. 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 July 31, 2013 and 2012 that could have an effect on the future computation of dilution per common share:

	Three Months Ended July 31,
	2013		2012
Stock options		14,161,455		15,103,955
Warrants		3,276,667		1,416,667
Restricted stock		25,000		12,500
Total common stock equivalents		17,463,122		16,533,122