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Note 10 - Business Segment Reporting - Operations by Business Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Nov. 29, 2015
Nov. 30, 2014
Nov. 29, 2015
Nov. 30, 2014
Packaged Fresh Vegetables [Member]        
Net sales $ 107,164,000 $ 102,079,000 $ 210,870,000 $ 202,185,000
International sales 19,800,000 17,760,000 40,605,000 35,911,000
Gross profit 9,979,000 11,151,000 23,231,000 23,005,000
Net income applicable to Common Stockholders (658,000) 3,644,000 2,602,000 7,290,000
Depreciation and amortization 1,448,000 1,237,000 3,015,000 2,247,000
Investment Income, Dividend 413,000 321,000 825,000 602,000
Interest income 16,000 15,000 22,000 26,000
Interest expense 410,000 425,000 877,000 763,000
Income Tax Expense (Benefit) (16,000) 440,000 905,000 1,310,000
Food Export [Member]        
Net sales 22,140,000 22,106,000 44,484,000 48,703,000
International sales 22,140,000 22,106,000 44,484,000 48,693,000
Gross profit 1,676,000 1,550,000 2,679,000 2,736,000
Net income applicable to Common Stockholders $ 1,176,000 582,000 1,277,000 853,000
Depreciation and amortization $ 1,000 $ 1,000 $ 2,000
Investment Income, Dividend
Interest income
Interest expense
Income Tax Expense (Benefit) $ 161,000 $ 95,000 $ 189,000 $ 139,000
Biomaterials [Member]        
Net sales 10,249,000 8,318,000 19,047,000 15,129,000
International sales 2,032,000 1,734,000 5,159,000 3,368,000
Gross profit 4,881,000 2,804,000 8,096,000 3,852,000
Net income applicable to Common Stockholders 1,393,000 (12,000) 1,461,000 (1,554,000)
Depreciation and amortization $ 641,000 $ 561,000 $ 1,246,000 $ 1,032,000
Investment Income, Dividend
Interest income $ 67,000 $ 25,000 $ 138,000
Interest expense $ 29,000 47,000 64,000 92,000
Income Tax Expense (Benefit) 393,000 (2,000) 412,000 (253,000)
Corporate Segment [Member]        
Net sales $ 888,000 $ 162,000 $ 1,395,000 $ 262,000
International sales
Gross profit $ 729,000 $ 161,000 $ 1,236,000 $ 261,000
Net income applicable to Common Stockholders (43,000) (991,000) (520,000) (1,013,000)
Depreciation and amortization $ 39,000 $ 31,000 $ 77,000 $ 62,000
Investment Income, Dividend
Interest income $ 9,000 $ 20,000
Interest expense
Income Tax Expense (Benefit) $ 531,000 $ 1,252,000 $ 1,254,000 $ 1,890,000
Net sales 140,441,000 132,665,000 275,796,000 266,279,000
International sales 43,972,000 41,600,000 90,248,000 87,972,000
Gross profit 17,265,000 15,666,000 35,242,000 29,854,000
Net income applicable to Common Stockholders 1,868,000 3,223,000 4,820,000 5,576,000
Depreciation and amortization 2,128,000 1,830,000 4,339,000 3,343,000
Investment Income, Dividend 413,000 321,000 825,000 602,000
Interest income 16,000 91,000 47,000 184,000
Interest expense 439,000 472,000 941,000 855,000
Income Tax Expense (Benefit) $ 1,069,000 $ 1,785,000 $ 2,760,000 $ 3,086,000