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Note 5 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 15 Months Ended
Aug. 30, 2015
Aug. 31, 2014
Aug. 30, 2015
May. 31, 2015
May. 25, 2014
Domestic Tax Authority [Member] | Earliest Tax Year [Member]          
Open Tax Year 1997        
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]          
Open Tax Year 1998        
Effective Income Tax Rate Reconciliation, Percent 36.00% 36.00%      
Income Tax Expense (Benefit) $ 1,691,000 $ 1,301,000      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00%    
Unrecognized Tax Benefits 864,000   $ 864,000   $ 1,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 720,000   $ 720,000 $ 800,000