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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 3,500 276,800
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   8 years 7 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   29.00% 32.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   2.10% 2.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   3.30% 4.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate, Maximum   16.00%  
Allocated Share-based Compensation Expense $ 208,000 $ 228,000 $ 307,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 362,000 652,000 371,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 1,506,000 5,161,000 917,000
Proceeds from Stock Options Exercised 365,000 848,000 228,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 495,000 $ 1,528,000 $ 240,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 20.09 $ 8.30
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 425,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 328 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 182 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 29,600,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 255 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 17,000,000    
Employee Stock Ownership Plan (ESOP), Shares in ESOP 1,536,000    
Employee Stock Purchase Plan, Eligibility Requirement, Length of Employment 2 years    
Stock Issued During Period, Shares, Employee Stock Purchase Plans 0    
Omnibus Plan [Member]      
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Authorized Per Individual 1,680,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Omnibus Plan [Member] | Stock Options or Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,800,000    
Omnibus Plan [Member] | SARS Dividend Equivalents and Other Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,800,000    
Special Stock Option Plan [Member] | Determined by Board of Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,800,000    
Other Plan Member | Determined By Chairman Member      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 50,000    
KEEP Program [Member]      
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Authorized Per Individual 6,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants, Period 2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 60.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 6 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 240,000    
Share Based Compensation Arrangement by Share Based Payment Award Percentage of Purchased Shares Matched 50.00%