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Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

v3.7.0.1
Significant Accounting Policies (Narrative) (Details) - USD ($)
 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Apr. 30, 2016
Cash and Cash Equivalents [Line Items]      
Amount of cash balance uninsured by FDIC $ 250,000    
Employee Stock Option [Member]      
Cash and Cash Equivalents [Line Items]      
Antidilutive securities 1,963,481 1,404,776  
Warrant [Member]      
Cash and Cash Equivalents [Line Items]      
Antidilutive securities 934,555 2,405,980  
Convertible Debt [Member]      
Cash and Cash Equivalents [Line Items]      
Antidilutive securities 75,596 75,596  
Convertible debt $ 350,000 $ 350,000  
Two Separate Institutions [Member]      
Cash and Cash Equivalents [Line Items]      
Amount of cash balance uninsured by FDIC $ 388,222   $ 1,224,863
Sales Revenue, Net [Member] | Non-US [Member]      
Cash and Cash Equivalents [Line Items]      
Percentage of revenues from students outside the United States 3.20%