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Note 9 - Business Segment Reporting (Details Textual)
9 Months Ended
Feb. 25, 2018
Feb. 26, 2017
Number of Operating Segments 3  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Packaged Fresh Vegetables [Member]    
Entity Wide Revenue Major Customer Number 2  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Top Five Customers [Member]    
Concentration Risk, Percentage 46.00% 43.00%
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 17.00% 14.00%