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Note 11 - Business Segment Reporting - Operations by Business Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 26, 2017
Feb. 28, 2016
Feb. 26, 2017
Feb. 28, 2016
Net sales $ 136,568 $ 129,990 $ 404,827 $ 405,786
International sales 39,102 35,308 133,285 125,556
Gross profit 23,432 12,931 63,529 48,173
Net income (loss) 3,500 (21,190) 8,138 (16,370)
Depreciation and amortization 2,717 2,147 7,827 6,486 [1]
Dividend income 413 413 1,238 1,238
Interest income 8 17 15 64
Interest expense, net 400 484 1,432 1,425
Income tax expense (benefit) 1,556 (12,510) 4,138 (9,750)
Packaged Fresh Vegetables [Member]        
Net sales 105,447 107,348 299,370 318,218
International sales 16,802 20,343 51,073 60,948
Gross profit 10,114 4,334 36,522 27,565
Net income (loss) (2,492) (36,963) (419) (34,361)
Depreciation and amortization 1,862 1,455 5,474 4,470
Dividend income 413 413 1,238 1,238
Interest income 8 17 15 39
Interest expense, net (77) 427 594 1,304
Income tax expense (benefit) (594) (905) (81)
Food Export [Member]        
Net sales 7,276 6,389 56,316 50,873
International sales 7,276 6,389 56,316 50,873
Gross profit 558 521 3,436 3,200
Net income (loss) (116) (27) 812 1,250
Depreciation and amortization 3 1
Dividend income
Interest income
Interest expense, net
Income tax expense (benefit) (33) (189) 229
Biomaterials [Member]        
Net sales 23,532 15,701 47,795 34,748
International sales 15,024 8,576 25,896 13,735
Gross profit 12,581 7,618 22,640 15,713
Net income (loss) 7,135 3,450 9,690 4,911
Depreciation and amortization 794 656 2,225 1,902
Dividend income
Interest income 25
Interest expense, net 57 13 121
Income tax expense (benefit) 2,031 973 2,769 1,385
Corporate Segment [Member]        
Net sales 313 552 1,346 1,947
International sales
Gross profit 179 458 931 1,695
Net income (loss) (1,027) 12,350 (1,945) 11,830
Depreciation and amortization 61 36 125 113
Dividend income
Interest income
Interest expense, net 477 825
Income tax expense (benefit) $ 152 $ (12,389) $ 1,221 $ (11,135)
[1] See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for a discussion of accounting principles adopted during the period.