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Organization, Use of Estimates and Basis of Presentation (Details 1)	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Total common stock equivalents	27,116,675	25,910,622
Warrant [Member]
Total common stock equivalents	3,126,667	3,276,667
Employee Stock Option [Member]
Total common stock equivalents	23,990,008	22,633,955

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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