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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
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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

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