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Note 14 - Business Segment Reporting (Details) - Operations by Business Segment (USD $)
 3 Months Ended
Aug. 25, 2013
Aug. 26, 2012
Segment Reporting Information [Line Items]    
Gross profit $ 12,532,000 $ 13,763,000
Net income (loss) 4,752,000 4,366,000
Dividend Income 281,000 281,000
Interest income 60,000 26,000
Interest expense 431,000 541,000
Income tax expense 2,500,000  
Food Products Technology [Member]
    
Segment Reporting Information [Line Items]    
Net sales 79,436,000 68,631,000
International sales 9,478,000 6,223,000
Gross profit 8,881,000 9,942,000
Net income (loss) 7,266,000 5,916,000
Depreciation and amortization 1,222,000 1,236,000
Dividend Income 281,000 281,000
Interest income 4,000 1,000
Interest expense 376,000 455,000
Income tax expense 505,000 1,972,000
Food Export [Member]
    
Segment Reporting Information [Line Items]    
Net sales 21,398,000 25,358,000
International sales 21,389,000 25,311,000
Gross profit 1,205,000 1,343,000
Net income (loss) 276,000 309,000
Depreciation and amortization 1,000 1,000
Income tax expense 78,000 103,000
HA-based Biomaterials [Member]
    
Segment Reporting Information [Line Items]    
Net sales 8,587,000 7,973,000
International sales 4,377,000 4,802,000
Gross profit 2,388,000 2,366,000
Net income (loss) (376,000) (312,000)
Depreciation and amortization 584,000 583,000
Interest income 56,000 25,000
Interest expense 55,000 86,000
Income tax expense (106,000) (104,000)
Corporate Segment [Member]
    
Segment Reporting Information [Line Items]    
Net sales 58,000 112,000
Gross profit 58,000 112,000
Net income (loss) (2,414,000) (1,547,000)
Depreciation and amortization 35,000 36,000
Income tax expense 1,998,000 594,000
Total [Member]
    
Segment Reporting Information [Line Items]    
Net sales 109,479,000 102,074,000
International sales 35,244,000 36,336,000
Gross profit 12,532,000 13,763,000
Net income (loss) 4,752,000 4,366,000
Depreciation and amortization 1,842,000 1,856,000
Dividend Income 281,000 281,000
Interest income 60,000 26,000
Interest expense 431,000 541,000
Income tax expense $ 2,475,000 $ 2,565,000