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Summary of Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
May 01, 2020
Summary of Accounting Policies (Details) [Line Items]      
Retained Earnings (Accumulated Deficit) $ (12,137) $ (2,111)  
Revenues 41,507 49,509  
Operating Lease, Right-of-Use Asset 10,864 0 $ 12,100
POC Revenue [Member]      
Summary of Accounting Policies (Details) [Line Items]      
Revenues $ 38,000 $ 45,300  
Building [Member]      
Summary of Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Other Depreciable Assets [Member] | Minimum [Member]      
Summary of Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Other Depreciable Assets [Member] | Maximum [Member]      
Summary of Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 10 years