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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 25, 2018
Nov. 26, 2017
Nov. 25, 2018
Nov. 26, 2017
Product sales $ 124,912 $ 122,461 $ 249,580 $ 238,242
Natural Foods [Member]        
Product sales 109,466 108,348 221,517 211,965
Biomaterials [Member]        
Product sales 15,446 14,113 28,063 26,277
Salads [Member] | Natural Foods [Member]        
Product sales 41,950 44,578 91,030 86,626
Aseptic [Member] | Biomaterials [Member]        
Product sales 8,128 7,591 13,894 14,618
Core Vegetables [Member] | Natural Foods [Member]        
Product sales 64,492 61,906 126,242 121,549
Fermentation [Member] | Biomaterials [Member]        
Product sales 1,915 2,865 4,985 5,655
Other [Member] | Natural Foods [Member]        
Product sales 3,024 1,864 4,245 3,790
Development Services [Member] | Biomaterials [Member]        
Product sales $ 5,403 $ 3,657 $ 9,184 $ 6,004