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Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

v3.7.0.1
Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Operating Loss Carryforwards [Line Items]    
Net change in the valuation allowance $ 402,888 $ 828,574
Net operating loss carryforwards $ 20,204,869  
Earliest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration Dec. 31, 2032  
Years under examination 2013  
Latest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration Dec. 31, 2037  
Years under examination 2016