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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 500 0 3,500
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 8 years   8 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 23.80%   29.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.40%   2.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 1.60%   3.30%
Allocated Share-based Compensation Expense, Total $ 161 $ 208 $ 228
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 140 362 652
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 3,000 1,500 5,200
Proceeds from Stock Options Exercised 560 365 848
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 886 $ 495 $ 1,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 44.50    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 268    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 109 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 146 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 27,300    
Share-based Compensation Arrangement by Share-based Payment Award, Options, 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, Aggregate Intrinsic Value $ 17,000    
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total 1,536,000    
Employee Stock Purchase Plan, Eligibility Requirement, Length of Employment 2 years    
Stock Issued During Period, Shares, Employee Stock Purchase Plans 0    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate, Maximum 0.00%   0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate, Minimum 0.00%   0.00%
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 240,000    
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, Award Vesting Period 6 years    
Share Based Compensation Arrangement by Share Based Payment Award Percentage of Purchased Shares Matched 50.00%    
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%