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Shareholders' Equity and Share-Based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 29, 2023
USD ($)
$ / shares
shares
Apr. 30, 2022
USD ($)
shares
May 01, 2021
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares authorized and undesignated (in shares) 120,000,000    
Common stock, shares authorized (in shares) 115,000,000 115,000,000  
Preferred stock, shares authorized (in shares) 50,000 50,000  
Common stock, shares undesignated (in shares) 4,950,000    
Number of preferred share purchase right 1    
Common share rights exercise, period 10 days    
Sale of stock, percentage of ownership after transaction 20.00%    
Common share rights exercise, period 10 years    
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) 1,801,000    
Share-based payment arrangement, nonvested award, cost not yet recognized, amount | $ $ 1,666    
Share-based payment arrangement, nonvested award, cost not yet recognized 2 years 11 months 8 days    
Exercisable shares (in shares) 1,222,000    
Option, exercise price range, upper range limit (in dollars per share) | $ / shares $ 4.81    
Exercised, aggregate intrinsic value | $ $ 7 $ 2 $ 0
Fair value of stock potions vested | $ $ 467 $ 465 $ 451
Stock issued during period, shares, employee stock purchase plans (in shares) 424,000 310,000 170,000
Share-based compensation expense | $ $ 2,746    
Proceeds from stock options exercised | $ 21 $ 8 $ 0
Share-based payment arrangement, expense, tax benefit | $ $ (23) (47) $ (70)
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, award vesting period 1 year    
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) 5,500,000    
Maximum employee subscription rate 15.00%    
Discount from market price, offering date 85.00%    
Common stock, capital shares reserved for future issuance (in shares) 1,575,000    
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, expiration period     10 years
Share-based compensation arrangement by share-based payment award, award vesting period     5 years
Stock options | Independent Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, expiration period     7 years
Share-based compensation arrangement by share-based payment award, award vesting period     1 year
Restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment arrangement, nonvested award, cost not yet recognized 2 years 7 months 13 days    
Fair value of restricted stock vested | $ $ 1,160 $ 1,203 $ 1,293
Restricted stock | Independent Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, award vesting period     1 year
Restricted stock | Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, award vesting period     5 years
In money options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable shares (in shares) 147    
Preferred Share Purchase Right      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of securities called by each warrant or right (in shares) 0.001    
Initial exercise price (in dollars per share) | $ / shares $ 20