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Note 9 - Business Segment Reporting (Details Textual)
3 Months Ended
Aug. 27, 2017
Aug. 28, 2016
Number of Operating Segments 3  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Packaged Fresh Vegetables [Member]    
Entity Wide Revenue Major Customer Number 2 2
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Top Five Customers [Member]    
Concentration Risk, Percentage 47.00% 47.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Costco [Member] | Packaged Fresh Vegetables [Member]    
Concentration Risk, Percentage 18.00% 17.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Wal-mart [Member] | Packaged Fresh Vegetables [Member]    
Concentration Risk, Percentage 18.00% 13.00%