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Property and Equipment (Schedule of Estimated Amortization Expense of Software) (Details) - USD ($)
Jul. 31, 2017
Apr. 30, 2017
Property, Plant and Equipment [Line Items]    
Intangible asset, net $ 150,839 $ 145,477
Software [Member]    
Property, Plant and Equipment [Line Items]    
2018 311,020  
2019 342,717  
2020 272,875  
2021 200,428  
2022 118,215  
Intangible asset, net $ 1,245,255 $ 1,137,327