Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Apr. 30, 2015
Significant Accounting Policies [Abstract]      
Restricted cash $ 1,122,485   $ 1,122,485
Cash and Cash Equivalents [Line Items]      
Cash, FDIC insured amount 250,000    
Institution One [Member]      
Cash and Cash Equivalents [Line Items]      
Amount of cash balance uninsured by FDIC 22,947    
Institution Two [Member]      
Cash and Cash Equivalents [Line Items]      
Amount of cash balance uninsured by FDIC 1,274,409    
Institution Three [Member]      
Cash and Cash Equivalents [Line Items]      
Amount of cash balance uninsured by FDIC $ 940,012    
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities 15,897,313 10,686,412  
Warrant [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities 28,871,757 31,858,524  
Convertible Debt [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities 1,207,143 1,207,143  
Convertible debt $ 650,000 $ 650,000