Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Income Taxes [Abstract]    
Net change in the valuation allowance $ 1,575,985 $ 1,979,374
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards $ 20,204,869  
Earliest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration Dec. 31, 2030  
Years under examination 2011  
Latest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration Dec. 31, 2035  
Years under examination 2014