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Note 9 - Business Segment Reporting - Operations by Business Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 27, 2017
Aug. 28, 2016
Net income (loss) $ 2,146 $ 3,312
Depreciation and amortization 2,954 2,550
Dividend income 413 413
Interest income 31 4
Interest expense, net 404 653
Income tax expense (benefit) 1,250 1,889
Net sales 123,357 132,394
International sales 29,249 48,225
Gross profit 19,286 21,144
Packaged Fresh Vegetables [Member]    
Net income (loss) 3,783 2,323
Depreciation and amortization 1,972 1,820
Dividend income 413 413
Interest income 11 4
Interest expense, net 550
Income tax expense (benefit) 1,096 655
Net sales 102,568 95,945
International sales 18,142 17,844
Gross profit 15,015 14,406
Food Export [Member]    
Net income (loss) (158) 194
Depreciation and amortization 1
Dividend income
Interest income
Interest expense, net
Income tax expense (benefit) (45) 55
Net sales 7,576 23,339
International sales 7,576 23,339
Gross profit 484 1,028
Biomaterials [Member]    
Net income (loss) (155) 1,243
Depreciation and amortization 865 712
Dividend income
Interest income
Interest expense, net 103
Income tax expense (benefit) (27) 350
Net sales 12,164 12,332
International sales 3,499 7,042
Gross profit 3,522 5,122
Corporate Segment [Member]    
Net income (loss) (1,324) (448)
Depreciation and amortization 117 17
Dividend income
Interest income 20
Interest expense, net 404
Income tax expense (benefit) 226 829
Net sales 1,049 778
International sales 32
Gross profit $ 265 $ 588