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Note I - Stock-based Compensation (Details Textual) - USD ($)
6 Months Ended 9 Months Ended
Aug. 26, 2020
Aug. 29, 2018
Aug. 05, 2015
Jan. 31, 2021
Jan. 31, 2021
Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         30,000 225,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value       $ 886,000   $ 9,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 28,400,000 $ 28,400,000 28,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)       260,750 260,750  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value       $ 14,600,000 $ 14,600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)         5 years 9 months 18 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)       $ 62.84 $ 62.84  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       245,000 245,000  
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense         $ 4,100,000 2,300,000
Share-based Payment Arrangement, Expense, after Tax         3,100,000 1,800,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 5,500,000 $ 5,500,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 9 months 18 days  
Restated Option Plan [Member]            
Share-based Payment Arrangement, Expense         $ 5,000,000.0 3,200,000
Share-based Payment Arrangement, Expense, after Tax         3,800,000 2,400,000
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        
Restated Option Plan [Member] | Share-based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years      
Stock Incentive Plan [Member]            
Share-based Payment Arrangement, Expense         839,000 798,000
Share-based Payment Arrangement, Expense, after Tax         638,000 $ 611,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     450,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)     100,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 6,200,000 $ 6,200,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         5 years 7 months 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)         7,690 7,224
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       87,009 87,009  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)       192,018 192,018  
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)         $ 51.70