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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 1,266 $ 1,178 $ 2,227 $ 2,075  
Liability for payment of the RSTUs $ 56,270   $ 56,270   $ 49,064
Employee Service-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awarded in period (shares) 8,200   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 $ 200 $ 200 $ 400 $ 200  
Liability for payment of the RSTUs $ 600   $ 600   $ 400
Cliff Vest [Member] | RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, years     3 years