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Note 15 - Business Segment Reporting (Detail) - Operations and identifiable assets by business segment consisted of the following: (USD $)
 3 Months Ended
Aug. 26, 2012
Aug. 28, 2011
Aug. 28, 2011
Aug. 28, 2012
Food Products Technology [Member]
Aug. 28, 2011
Food Products Technology [Member]
Aug. 28, 2012
Food Export [Member]
Aug. 28, 2011
Food Export [Member]
Aug. 28, 2012
HA-based Biomaterials [Member]
Aug. 28, 2011
HA-based Biomaterials [Member]
Aug. 28, 2012
Corporate [Member]
Aug. 28, 2011
Corporate [Member]
Aug. 28, 2012
Total [Member]
Aug. 28, 2011
Total [Member]
Net sales       $ 68,631,000 $ 43,363,000 $ 25,358,000 $ 21,355,000 $ 7,973,000 $ 7,121,000 $ 112,000 $ 1,462,000 $ 102,074,000 $ 73,301,000
International sales       6,223,000 5,071,000 25,311,000 21,310,000 4,802,000 3,766,000     36,336,000 30,147,000
Gross profit 13,763,000 11,250,000   9,942,000 6,059,000 1,343,000 1,014,000 2,366,000 2,715,000 112,000 1,462,000 13,763,000 11,250,000
Net income (loss) 4,366,000 1,812,000 1,812,000 5,916,000 3,358,000 309,000 297,000 (312,000) 462,000 (1,547,000) (2,305,000) 4,366,000 1,812,000
Depreciation and amortization       1,236,000 780,000 1,000 2,000 583,000 528,000 36,000 45,000 1,856,000 1,355,000
Dividend Income 281,000 281,000   281,000 281,000             281,000 281,000
Interest income 26,000 76,000   1,000 8,000     25,000 47,000   21,000 26,000 76,000
Interest expense 541,000 176,000   455,000       86,000 176,000     541,000 176,000
Income tax expense $ 2,565,000 $ 1,110,000   $ 1,972,000   $ 103,000   $ (104,000)   $ 594,000 $ 1,110,000 $ 2,565,000 $ 1,110,000