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Note 8 - Stockholders' Equity (Details) (USD $)
0 Months Ended 12 Months Ended
Jul. 14, 2010
May 26, 2013
May 27, 2012
May 29, 2011
May 24, 2013
May 30, 2010
Note 8 - Stockholders' Equity (Details) [Line Items]            
Common Stock, Voting Rights   one        
Preferred Stock, Shares Authorized   2,000,000        
Common Stock, Capital Shares Reserved for Future Issuance   1,900,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   422,977 449,643 640,976   770,311
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years        
Shares Paid for Tax Withholding for Share Based Compensation   145,159 326,954 136,374    
Payments Related to Tax Withholding for Share-based Compensation (in Dollars)   $ 49,000 $ 260,000 $ 218,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   3 years 3 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number   1,262,934 1,620,562      
Share Price (in Dollars per share)         $ 13.88  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)   4,100,000        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)   418,000        
Stock Repurchase Program, Authorized Amount (in Dollars) 10,000,000          
Stock Repurchased and Retired During Period, Shares     917,244 215,684    
Stock Repurchased and Retired During Period, Value (in Dollars)     $ 5,000,000 $ 1,200,000    
Optionee First Becomes Non-Employee Director [Member] | 1995 Directors' Stock Option Plan [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Shares Purchasable with Nonstatutory Stock Option   20,000        
Served on Board of Directors for at Least Six Months [Member] | 1995 Directors' Stock Option Plan [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Shares Purchasable with Nonstatutory Stock Option   10,000        
In the Money [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options   1,262,934        
Stock Options [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   1,339,892 2,046,432 2,318,753   2,456,829
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2 years        
Stock Options [Member] | Maximum [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   500,000        
Stock Grants and Stock Units [Member] | Maximum [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   250,000        
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   500,000        
Restricted Stock Units (RSUs) [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   1 year 255 days        
Director [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance   30,000        
2005 Plan [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   861,038        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   344,300        
1996 Non-Executive Stock Option Plan [Member]
           
Note 8 - Stockholders' Equity (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years