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Note I - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Aug. 26, 2020
Aug. 29, 2018
Aug. 05, 2015
Jul. 31, 2021
Jul. 31, 2020
Aug. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       30,000 30,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value       $ 2,100,000 $ 886,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 46,200,000 20,600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)       269,900    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value       $ 24,400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)       5 years 4 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price (in dollars per share)       $ 68.49    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       215,000    
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense       $ 2,800,000 1,100,000  
Share-based Payment Arrangement, Expense, after Tax       2,100,000 877,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 4,200,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 6 months    
Restated Option Plan [Member]            
Share-based Payment Arrangement, Expense       $ 3,000,000.0 2,300,000  
Share-based Payment Arrangement, Expense, after Tax       $ 2,300,000 1,800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 2,200,000 2,000,000 1,800,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 200,000 200,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)       30,000    
Restated Option Plan [Member] | Share-based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years      
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       21,219    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)       8,781    
Stock Incentive Plan [Member]            
Share-based Payment Arrangement, Expense       $ 197,000 281,000  
Share-based Payment Arrangement, Expense, after Tax       151,000 $ 215,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   450,000       100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 6,000,000.0    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       5 years 1 month 6 days    
Stock Incentive Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       4,500 2,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       89,318    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)       189,709    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)       $ 53.99