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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 961 $ 897  
Liability for payment of the RSTUs $ 48,693   $ 49,064
Employee Service-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awarded in period (shares) 67,006    
Vesting period 2 years    
Employee Performance-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awarded in period (shares) 124,374    
Common stock issuable per RSU granted (shares) 1    
Employee Performance-Based RSTUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units non vested grants (shares) 11,456    
Employee Service-Based RSTUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units non vested grants (shares) 6,229    
RSTUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, years 3 years    
Stock-based compensation expense $ 300 $ 0  
Liability for payment of the RSTUs $ 400   $ 400
Cliff Vest [Member] | RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, years 3 years