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Property and Equipment (Schedule of Estimated Amortization Expense of Software) (Details) - USD ($)
Jul. 31, 2019
Apr. 30, 2019
Property, Plant and Equipment [Line Items]    
Intangible asset, net $ 145,063 $ 161,930
Software [Member]    
Property, Plant and Equipment [Line Items]    
2020 689,009  
2021 854,804  
2022 765,330  
2023 605,091  
2024 315,809  
Thereafter 17,789  
Intangible asset, net $ 3,247,832 $ 2,963,005