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Note 12 - Business Segment Reporting - Operations by Business Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 28, 2016
Mar. 01, 2015
Feb. 28, 2016
Mar. 01, 2015
Packaged Fresh Vegetables [Member]        
Net sales $ 107,348,000 $ 115,392,000 $ 318,218,000 $ 317,577,000
International sales 20,343,000 21,423,000 60,948,000 57,334,000
Gross profit 4,334,000 9,735,000 27,565,000 32,739,000
Net income (loss) (36,963,000) 2,949,000 (34,361,000) 10,239,000
Depreciation and amortization 1,455,000 1,232,000 4,470,000 3,479,000
Investment Income, Dividend 413,000 413,000 1,238,000 1,015,000
Interest income 17,000 5,000 39,000 31,000
Interest expense (427,000) (467,000) $ (1,304,000) (1,230,000)
Income tax benefit (expense) 905,000 (323,000) (1,633,000)
Food Export [Member]        
Net sales 6,389,000 8,199,000 $ 50,873,000 56,902,000
International sales 6,389,000 8,086,000 50,873,000 56,779,000
Gross profit 521,000 771,000 3,200,000 3,507,000
Net income (loss) $ (27,000) (6,000) 1,250,000 847,000
Depreciation and amortization $ 1,000 $ 1,000 $ 3,000
Investment Income, Dividend
Interest income
Interest expense
Income tax benefit (expense) $ 189,000 $ (139,000)
Biomaterials [Member]        
Net sales 15,701,000 $ 14,799,000 $ 34,748,000 29,928,000
International sales 8,576,000 8,394,000 13,735,000 11,762,000
Gross profit 7,618,000 6,258,000 15,713,000 10,110,000
Net income (loss) 3,450,000 3,047,000 4,911,000 1,493,000
Depreciation and amortization $ 656,000 $ 568,000 $ 1,902,000 $ 1,600,000
Investment Income, Dividend
Interest income $ 73,000 $ 25,000 $ 211,000
Interest expense $ (57,000) (43,000) (121,000) (135,000)
Income tax benefit (expense) (973,000) (496,000) (1,385,000) (243,000)
Corporate Segment [Member]        
Net sales $ 552,000 $ 140,000 $ 1,947,000 $ 402,000
International sales
Gross profit $ 458,000 $ 121,000 $ 1,695,000 $ 382,000
Net income (loss) 12,350,000 (2,218,000) 11,830,000 (3,231,000)
Depreciation and amortization $ 36,000 $ 33,000 $ 113,000 $ 95,000
Investment Income, Dividend
Interest income $ 7,000 $ 27,000
Interest expense
Income tax benefit (expense) $ 12,389,000 $ (1,505,000) $ 11,135,000 $ (3,394,000)
Net sales 129,990,000 138,530,000 405,786,000 404,809,000
International sales 35,308,000 37,903,000 125,556,000 125,875,000
Gross profit 12,931,000 16,885,000 48,173,000 46,738,000
Net income (loss) (21,190,000) 3,772,000 (16,370,000) 9,348,000
Depreciation and amortization 2,147,000 1,834,000 6,486,000 5,177,000
Investment Income, Dividend 413,000 413,000 1,238,000 1,015,000
Interest income 17,000 85,000 64,000 269,000
Interest expense (484,000) (510,000) (1,425,000) (1,365,000)
Income tax benefit (expense) $ 12,510,000 $ (2,324,000) $ 9,750,000 $ (5,409,000)