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Note 11 - Business Segment Reporting (Details) - Operations by Business Segment (USD $) | 3 Months Ended
--- | ---
Aug. 31, 2014 | Aug. 25, 2013
Segment Reporting Information [Line Items] |  |
Net sales | $ 133,614,000 | $ 109,479,000
International sales | 46,372,000 | 35,244,000
Gross profit | 14,188,000 | 12,532,000
Net income (loss) | 2,353,000 | 4,752,000
Depreciation and amortization | 1,513,000 | 1,842,000
Dividend Income | 281,000 | 281,000
Interest income | 93,000 | 60,000
Interest expense | 383,000 | 431,000
Income tax expense | 1,301,000 | 2,475,000
Food Products Technology [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 100,106,000 | 79,436,000
International sales | 18,151,000 | 9,478,000
Gross profit | 11,854,000 | 8,881,000
Net income (loss) | 3,646,000 | 7,266,000
Depreciation and amortization | 1,010,000 | 1,222,000
Dividend Income | 281,000 | 281,000
Interest income | 11,000 | 4,000
Interest expense | 338,000 | 376,000
Income tax expense | 870,000 | 505,000
Food Export [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 26,597,000 | 21,398,000
International sales | 26,587,000 | 21,389,000
Gross profit | 1,186,000 | 1,205,000
Net income (loss) | 271,000 | 276,000
Depreciation and amortization | 1,000 | 1,000
Income tax expense | 44,000 | 78,000
HA-based Biomaterials [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 6,811,000 | 8,587,000
International sales | 1,634,000 | 4,377,000
Gross profit | 1,048,000 | 2,388,000
Net income (loss) | (1,542,000) | (376,000)
Depreciation and amortization | 471,000 | 584,000
Interest income | 71,000 | 56,000
Interest expense | 45,000 | 55,000
Income tax expense | (251,000) | (106,000)
Corporate Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 100,000 | 58,000
Gross profit | 100,000 | 58,000
Net income (loss) | (22,000) | (2,414,000)
Depreciation and amortization | 31,000 | 35,000
Interest income | 11,000 |
Income tax expense | $ 638,000 | $ 1,998,000

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