Note 8 - Stock-Based Compensation (Details) (USD $)	12 Months Ended
	May 03, 2014	Apr. 27, 2013	Apr. 28, 2012
Note 8 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	5,245
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	8 years	8 years	8 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	35.80%	38.10%	42.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.90%	1.60%	2.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	4.60%	5.00%	5.30%
Allocated Share-based Compensation Expense	$ 95,000	$ 230,000	$ 290,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	90,000	453,000	513,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	76,000	406,000	758,000
Proceeds from Stock Options Exercised	47,000	239,000	115,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	17,000	201,000	295,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 12.50	$ 8.76	$ 8.16
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	262,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 328 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	5,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 3,600,000
Employee Stock Ownership Plan (ESOP), Shares in ESOP (in Shares)	1,536,000
Stock Options or Stock Awards [Member] | Omnibus Plan [Member]
Note 8 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	4,800,000
SARS, Dividend Equivalents and Other Awards [Member] | Omnibus Plan [Member]
Note 8 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	4,800,000
Determined by Board of Directors [Member] | Special Stock Option Plan [Member]
Note 8 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	1,800,000
Determined by Chairman [Member] | Other Plan [Member]
Note 8 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	50,000
KEEP Program [Member]
Note 8 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	5,245	2,000	3,000
Omnibus Plan [Member]
Note 8 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Per Individual (in Shares)	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
KEEP Program [Member]
Note 8 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	240,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Per Individual (in Shares)	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, Purchase Price of Common Stock, Percent	60.00%