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Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

v3.5.0.2
Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards $ 22,322,804  
Net change in the valuation allowance $ 828,574 $ 1,575,985
Earliest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration Dec. 31, 2031  
Years under examination 2012  
Latest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration Dec. 31, 2036  
Years under examination 2015