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Note K - Stock-based Compensation Plans (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Aug. 29, 2018
Aug. 05, 2015
Apr. 30, 2019
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Aug. 04, 2015
Share-based Payment Arrangement, Expense       $ 3,700,000 $ 1,600,000 $ 1,300,000  
Share-based Payment Arrangement, Expense, after Tax       2,800,000 1,100,000 $ 811,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 29,900,000 $ 29,900,000 $ 10,400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       145,000 25,000 45,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options Exercised Through Net Settlements       108,750      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Reduction in Shares Issued to Satisfy the Exercise Price and Applicable Withholding Taxes       48,380      
Share-based Compensation Arrangement by Share-based Payment Award, Options Exercised Through Net Settlements, Net of Shares to Satisfy the Exercise Price and Applicable Withholding Taxes       60,370      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number     137,000 137,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value     $ 8,500,000 $ 8,500,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term       3 years 182 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price     $ 36.78 $ 36.78      
Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years      
Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years      
Share-based Payment Arrangement, Option [Member]              
Share-based Payment Arrangement, Expense       $ 2,700,000 $ 1,200,000 $ 1,200,000  
Share-based Payment Arrangement, Expense, after Tax       $ 2,000,000 773,000 728,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       145,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value       $ 3,000,000 336,000 461,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 3,000,000 $ 3,000,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       1 year 328 days      
Performance Shares [Member]              
Share-based Payment Arrangement, Expense     $ 823,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance     61,000 61,000      
Restated Option Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 200,000 300,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 2,000,000 1,800,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     298,500 298,500      
Restated Option Plan [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years          
Stock Incentive Plan [Member]              
Share-based Payment Arrangement, Expense       $ 1,000,000 430,000 107,000  
Share-based Payment Arrangement, Expense, after Tax       760,000 288,000 67,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   450,000         350,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 6,700,000 $ 6,700,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       7 years 73 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value       $ 8,300,000 $ 8,200,000 $ 763,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       3,000 166,500 10,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 53.30 $ 45.86 $ 39.14  
Stock Incentive Plan [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       3,000   10,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 53.30   $ 39.14  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     105,527 105,527      
Stock Incentive Plan [Member] | First Issuance of Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         132,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 48.70    
Stock Incentive Plan [Member] | Second Issuance of Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         34,500    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 35