Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Net Income (Loss) Per Share (Details)

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Summary of Significant Accounting Policies - Net Income (Loss) Per Share (Details) - shares
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities not included in diluted net loss per common share computation 2,427,085 1,781,364
Convertible Notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities not included in diluted net loss per common share computation 0 80,000
Convertible Notes | Related Parties    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities not included in diluted net loss per common share computation 9,070 17,007
Series A Preferred Shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities not included in diluted net loss per common share computation 0 522,167
Series B Preferred Shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities not included in diluted net loss per common share computation 2,210,390 0
Warrant    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities not included in diluted net loss per common share computation 207,625 1,102,758
Common Shares Reserved for Series A Preferred Share Dividends    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities not included in diluted net loss per common share computation 0 17,517
Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities not included in diluted net loss per common share computation 0 41,915