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Right-of-Use Assets and Lease Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Disclosure Text Block [Abstract]    
Operating Leases, Rent Expense $ 1.6 $ 1.2
Operating Lease, Weighted Average Remaining Lease Term 8 years 109 days  
Operating Lease, Weighted Average Discount Rate, Percent 6.19%  
Operating Lease, Payments $ 1.7  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 12.1