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Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

v3.5.0.2
Significant Accounting Policies (Narrative) (Details) - USD ($)
 3 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Apr. 30, 2016
Employee Stock Option [Member]      
Cash and Cash Equivalents [Line Items]      
Antidilutive securities 22,421,102 15,897,313  
Warrant [Member]      
Cash and Cash Equivalents [Line Items]      
Antidilutive securities 10,464,657 28,871,757  
Convertible Debt [Member]      
Cash and Cash Equivalents [Line Items]      
Antidilutive securities 907,143 1,207,143  
Convertible debt $ 350,000 $ 650,000  
Two Separate Institutions [Member]      
Cash and Cash Equivalents [Line Items]      
Amount of cash balance uninsured by FDIC $ 292,764   $ 1,224,863