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Note I - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Aug. 26, 2020
Aug. 29, 2018
Aug. 05, 2015
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)           30,000 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value       $ 886,000 $ 974,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 15,600,000 $ 23,100,000 $ 15,600,000 $ 23,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)       272,184   272,184  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value       $ 8,800,000   $ 8,800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)           5 years 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price (in dollars per share)       $ 55.23   $ 55.23  
Share-based Payment Arrangement, Option [Member]              
Share-based Payment Arrangement, Expense           $ 2,200,000 1,700,000
Share-based Payment Arrangement, Expense, after Tax           1,700,000 1,300,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 6,500,000   $ 6,500,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 1 month 6 days  
Restated Option Plan [Member]              
Share-based Payment Arrangement, Expense           $ 3,700,000 2,200,000
Share-based Payment Arrangement, Expense, after Tax           $ 2,800,000 1,700,000
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, Number of Shares Available for Grant (in shares)       245,000   245,000  
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           $ 561,000 521,000
Share-based Payment Arrangement, Expense, after Tax           426,000 $ 399,000
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       $ 5,900,000   $ 5,900,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           5 years 9 months 18 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)           2,000 3,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       92,199   92,199  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)       186,828   186,828  
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)           $ 49.88