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Note 14 - Business Segment Reporting (Details) - Operations by Business Segment (USD $)
 12 Months Ended
May 26, 2013
May 27, 2012
May 29, 2011
Segment Reporting Information [Line Items]      
Gross profit $ 62,760,000 $ 52,138,000 $ 46,695,000
Net income (loss) 22,587,000 12,696,000 3,920,000
Identifiable assets 290,942,000 277,692,000  
Capital expenditures 8,877,000 5,371,000 6,684,000
Dividend Income 1,125,000 1,125,000 328,000
Interest income 179,000 180,000 430,000
Interest expense 2,008,000 929,000 820,000
Income tax expense 9,452,000 7,185,000 4,181,000
Food Products Technology [Member]
      
Segment Reporting Information [Line Items]      
Net sales 320,447,000 207,582,000 175,664,000
International sales 27,532,000 20,528,000 18,580,000
Gross profit 37,077,000 25,237,000 18,888,000
Net income (loss) 20,526,000 17,527,000 8,200,000
Identifiable assets 180,104,000 169,541,000 88,241,000
Depreciation and amortization 4,761,000 3,191,000 3,174,000
Capital expenditures 5,598,000 2,498,000 3,620,000
Dividend Income 1,125,000 1,125,000 328,000
Interest income 42,000 30,000 129,000
Interest expense 1,707,000 178,000 2,000
Income tax expense 3,399,000    
Food Export [Member]
      
Segment Reporting Information [Line Items]      
Net sales 78,568,000 71,485,000 61,663,000
International sales 78,442,000 71,054,000 61,214,000
Gross profit 5,274,000 4,900,000 3,901,000
Net income (loss) 1,660,000 2,269,000 1,617,000
Identifiable assets 21,737,000 18,425,000 16,320,000
Depreciation and amortization 4,000 7,000 8,000
Income tax expense 339,000    
HA-based Biomaterials [Member]
      
Segment Reporting Information [Line Items]      
Net sales 41,281,000 34,283,000 32,505,000
International sales 26,792,000 22,904,000 24,024,000
Gross profit 19,102,000 17,994,000 17,231,000
Net income (loss) 6,835,000 7,672,000 7,278,000
Identifiable assets 80,940,000 81,927,000 83,954,000
Depreciation and amortization 2,379,000 2,242,000 1,972,000
Capital expenditures 3,190,000 2,798,000 2,817,000
Interest income 137,000 129,000 164,000
Interest expense 301,000 751,000 818,000
Income tax expense 1,400,000    
Corporate [Member]
      
Segment Reporting Information [Line Items]      
Net sales 1,412,000 4,202,000 6,897,000
Gross profit 1,307,000 4,007,000 6,675,000
Net income (loss) (6,434,000) (14,772,000) (13,175,000)
Identifiable assets 8,161,000 7,799,000 17,797,000
Depreciation and amortization 151,000 181,000 159,000
Capital expenditures 89,000 75,000 247,000
Interest income   21,000 137,000
Income tax expense 4,314,000 7,185,000 4,181,000
Total [Member]
      
Segment Reporting Information [Line Items]      
Net sales 441,708,000 317,552,000 276,729,000
International sales 132,766,000 114,486,000 103,818,000
Gross profit 62,760,000 52,138,000 46,695,000
Net income (loss) 22,587,000 12,696,000 3,920,000
Identifiable assets 290,942,000 277,692,000 206,312,000
Depreciation and amortization 7,295,000 5,621,000 5,313,000
Capital expenditures 8,877,000 5,371,000 6,684,000
Dividend Income 1,125,000 1,125,000 328,000
Interest income 179,000 180,000 430,000
Interest expense 2,008,000 929,000 820,000
Income tax expense $ 9,452,000 $ 7,185,000 $ 4,181,000