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Note 14 - Business Segment Reporting (Details) - Operations by Business Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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May 25, 2014 | Feb. 23, 2014 | Nov. 24, 2013 | Aug. 25, 2013 | May 26, 2013 | Feb. 24, 2013 | Nov. 25, 2012 | Aug. 26, 2012 | May 27, 2012 | Feb. 26, 2012 | Nov. 27, 2011 | Aug. 28, 2011 | May 25, 2014 | May 26, 2013 | May 28, 2013 | May 27, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 476,813 | $ 441,708 |  | $ 317,552
International sales |  |  |  |  |  |  |  |  |  |  |  |  | 137,246 | 132,766 |  | 114,486
Gross profit | 16,143 | 20,155 | 13,734 | 12,532 | 13,030 | 17,508 | 18,459 | 13,763 | 14,706 | 13,172 | 13,010 | 11,250 | 62,564 | 62,760 |  | 52,138
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 19,145 | 22,587 |  | 12,696
Identifiable assets | 313,623 |  |  |  | 290,942 |  |  |  | 277,692 |  |  |  | 313,623 | 290,942 |  | 277,692
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 7,114 | 7,295 | 7,295 | 5,621
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 14,886 | 8,877 | 8,877 | 5,371
Dividend Income |  |  |  |  |  |  |  |  |  |  |  |  | 1,125 | 1,125 | 1,125 | 1,125
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 260 | 179 | 179 | 180
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,650 | 2,008 | 2,008 | 929
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 10,583 | 9,452 | 9,452 | 7,185
Food Products Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 360,728 | 320,447 |  | 207,582
International sales |  |  |  |  |  |  |  |  |  |  |  |  | 47,224 | 27,532 |  | 20,528
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 36,318 | 37,077 |  | 25,237
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 19,041 | 20,526 |  | 17,527
Identifiable assets | 196,257 |  |  |  | 180,104 |  |  |  | 169,541 |  |  |  | 196,257 | 180,104 |  | 169,541
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 4,751 |  | 4,761 | 3,191
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 10,950 |  | 5,598 | 2,498
Dividend Income |  |  |  |  |  |  |  |  |  |  |  |  | 1,125 |  | 1,125 | 1,125
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  | 42 | 30
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,402 |  | 1,707 | 178
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  | 3,399 |
Food Export [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 69,827 | 78,568 |  | 71,485
International sales |  |  |  |  |  |  |  |  |  |  |  |  | 69,710 | 78,442 |  | 71,054
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 5,340 | 5,274 |  | 4,900
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 1,973 | 1,660 |  | 2,269
Identifiable assets | 25,391 |  |  |  | 21,737 |  |  |  | 18,425 |  |  |  | 25,391 | 21,737 |  | 18,425
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  | 4 | 7
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 339 |
HA-based Biomaterials [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 45,704 | 41,281 |  | 34,283
International sales |  |  |  |  |  |  |  |  |  |  |  |  | 20,312 | 26,792 |  | 22,904
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 20,456 | 19,102 |  | 17,994
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 9,695 | 6,835 |  | 7,672
Identifiable assets | 85,858 |  |  |  | 80,940 |  |  |  | 81,927 |  |  |  | 85,858 | 80,940 |  | 81,927
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 2,221 |  | 2,379 | 2,242
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 3,877 |  | 3,190 | 2,798
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 242 |  | 137 | 129
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 248 |  | 301 | 751
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  | 1,400 |
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 554 | 1,412 |  | 4,202
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 450 | 1,307 |  | 4,007
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (11,564) | (6,434) |  | (14,772)
Identifiable assets | 6,117 |  |  |  | 8,161 |  |  |  | 7,799 |  |  |  | 6,117 | 8,161 |  | 7,799
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 136 |  | 151 | 181
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 59 |  | 89 | 75
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  | 21
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,530 |  | $ 4,314 | $ 7,185

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