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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
May 27, 2018
May 28, 2017
May 29, 2016
Balance $ 228,152    
Other comprehensive income, net 716 $ 432
Balance 252,562 228,152  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Balance 432    
Other comprehensive income before reclassifications, net of tax effect 716    
Amounts reclassified from OCI    
Other comprehensive income, net 716    
Balance $ 1,148 $ 432