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Note I - Stock-based Compensation (Details Textual) - USD ($)
9 Months Ended
Aug. 26, 2020
Aug. 29, 2018
Aug. 05, 2015
Jan. 31, 2022
Jan. 31, 2021
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       $ 14,200,000 28,400,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)       288,400    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value       $ 8,700,000    
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)       $ 72.60    
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       $ 4,000,000.0 4,100,000  
Share-based Payment Arrangement, Expense, after Tax       3,100,000 3,100,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 2,900,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 1 month 6 days    
Restated Option Plan [Member]            
Share-based Payment Arrangement, Expense       $ 4,700,000 5,000,000.0  
Share-based Payment Arrangement, Expense, after Tax       $ 3,600,000 3,800,000  
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)       50,000    
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)       32,838    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)       17,162    
Stock Incentive Plan [Member]            
Share-based Payment Arrangement, Expense       $ 656,000 839,000  
Share-based Payment Arrangement, Expense, after Tax       497,000 $ 638,000  
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       $ 5,700,000    
Stock Incentive Plan [Member] | Restricted Stock [Member]            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       4 years 8 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       10,250 7,690  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       91,684    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)       180,843    
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)       $ 55.86