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Note 9 - Business Segment Reporting - Operations by Business Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 26, 2017
Nov. 27, 2016
Nov. 26, 2017
Nov. 27, 2016
Net sales $ 136,457 $ 135,865 $ 259,814 $ 268,259
International sales 34,416 45,954 63,665 94,179
Gross profit 15,752 18,953 35,038 40,097
Net income (loss) 487 1,326 2,633 4,638
Depreciation and amortization 2,980 2,550 5,934 5,110
Dividend income 412 412 825 825
Interest income 42 4 74 7
Interest expense, net 480 380 884 1,032
Income tax expense (benefit) 207 693 1,458 2,582
Packaged Fresh Vegetables [Member]        
Net sales 107,152 97,978 209,720 193,923
International sales 17,708 16,422 35,850 34,266
Gross profit 9,445 12,001 24,460 26,407
Net income (loss) (270) (250) 3,513 2,073
Depreciation and amortization 1,958 1,792 3,930 3,612
Dividend income 412 412 825 825
Interest income 18 4 29 7
Interest expense, net 122 671
Income tax expense (benefit) (95) (142) 1,002 513
Food Export [Member]        
Net sales 13,992 25,701 21,568 49,040
International sales 13,992 25,701 21,568 49,040
Gross profit 826 1,850 1,310 2,878
Net income (loss) 110 733 (48) 928
Depreciation and amortization 2 3
Dividend income
Interest income
Interest expense, net
Income tax expense (benefit) 31 207 (14) 262
Biomaterials [Member]        
Net sales 14,113 11,931 26,277 24,263
International sales 2,675 3,831 6,174 10,873
Gross profit 5,217 4,938 8,739 10,060
Net income (loss) 1,260 1,312 1,105 2,555
Depreciation and amortization 910 719 1,775 1,431
Dividend income
Interest income
Interest expense, net (90) 13
Income tax expense (benefit) 374 388 347 738
Corporate Segment [Member]        
Net sales 1,200 255 2,249 1,033
International sales 41 73
Gross profit 264 164 529 752
Net income (loss) (613) (469) (1,937) (918)
Depreciation and amortization 112 37 229 64
Dividend income
Interest income 24 45
Interest expense, net 480 348 884 348
Income tax expense (benefit) $ (103) $ 240 $ 123 $ 1,069