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, 2018
Apr. 30, 2017
Operating Loss Carryforwards [Line Items]    
Net change in the valuation allowance $ 1,633,907 $ (402,888)
Net operating loss carryforwards $ 29,780,000  
Earliest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration Dec. 31, 2033  
Years under examination 2014  
Latest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards, expiration Dec. 31, 2038  
Years under examination 2017