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Note 11 - Business Segment Reporting (Tables) | 12 Months Ended
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May. 31, 2015
Notes Tables |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | May 31, 2015 |  |  | May 25, 2014 |  |  | May 26, 2013 |
Canada |  | $ | 79.7 |  |  | $ | 46.6 |  |  | $ | 27.8 |
Taiwan |  | $ | 32.1 |  |  | $ | 30.7 |  |  | $ | 31.0 |
Indonesia |  | $ | 9.0 |  |  | $ | 9.6 |  |  | $ | 21.0 |
China |  | $ | 9.0 |  |  | $ | 8.2 |  |  | $ | 5.0 |
Japan |  | $ | 8.5 |  |  | $ | 9.9 |  |  | $ | 10.6 |
Belgium |  | $ | 6.8 |  |  | $ | 13.1 |  |  | $ | 16.6 |
All Other Countries |  | $ | 18.4 |  |  | $ | 19.1 |  |  | $ | 20.8 |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Food Products |  |  |  |  |  | Hyaluronan-based |  |  |  |  |  |  |
Fiscal Year Ended May 31, 2015 |  | Technology |  |  | Food Export |  |  | Biomaterials |  |  | Corporate |  |  | TOTAL |
Net sales |  | $ | 430,415 |  |  | $ | 67,837 |  |  | $ | 40,432 |  |  | $ | 573 |  |  | $ | 539,257 |
International sales |  | $ | 80,500 |  |  | $ | 67,714 |  |  | $ | 15,246 |  |  | $ | — |  |  | $ | 163,460 |
Gross profit |  | $ | 45,993 |  |  | $ | 4,252 |  |  | $ | 14,609 |  |  | $ | 553 |  |  | $ | 65,407 |
Net income (loss) |  | $ | 17,145 |  |  | $ | 1,041 |  |  | $ | 3,838 |  |  | $ | (8,480 | ) |  | $ | 13,544 |
Identifiable assets |  | $ | 228,672 |  |  | $ | 27,746 |  |  | $ | 85,779 |  |  | $ | 4,268 |  |  | $ | 346,465 |
Depreciation and amortization |  | $ | 4,766 |  |  | $ | 6 |  |  | $ | 2,184 |  |  | $ | 134 |  |  | $ | 7,090 |
Capital expenditures |  | $ | 12,895 |  |  | $ | — |  |  | $ | 4,499 |  |  | $ | 117 |  |  | $ | 17,511 |
Dividend income |  | $ | 1,417 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,417 |
Interest income |  | $ | 32 |  |  | $ | — |  |  | $ | 254 |  |  | $ | 29 |  |  | $ | 315 |
Interest expense |  | $ | 1,655 |  |  | $ | — |  |  | $ | 174 |  |  | $ | — |  |  | $ | 1,829 |
Income tax expense |  | $ | 792 |  |  | $ | 48 |  |  | $ | 177 |  |  | $ | 6,729 |  |  | $ | 7,746 |
Fiscal Year Ended May 25, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 360,728 |  |  | $ | 69,827 |  |  | $ | 45,704 |  |  | $ | 554 |  |  | $ | 476,813 |
International sales |  | $ | 47,224 |  |  | $ | 69,710 |  |  | $ | 20,312 |  |  | $ | — |  |  | $ | 137,246 |
Gross profit |  | $ | 36,318 |  |  | $ | 5,340 |  |  | $ | 20,456 |  |  | $ | 450 |  |  | $ | 62,564 |
Net income (loss) |  | $ | 19,041 |  |  | $ | 1,973 |  |  | $ | 9,695 |  |  | $ | (11,564 | ) |  | $ | 19,145 |
Identifiable assets |  | $ | 196,257 |  |  | $ | 25,391 |  |  | $ | 85,858 |  |  | $ | 6,117 |  |  | $ | 313,623 |
Depreciation and amortization |  | $ | 4,751 |  |  | $ | 6 |  |  | $ | 2,221 |  |  | $ | 136 |  |  | $ | 7,114 |
Capital expenditures |  | $ | 10,950 |  |  | $ | — |  |  | $ | 3,877 |  |  | $ | 59 |  |  | $ | 14,886 |
Dividend income |  | $ | 1,125 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,125 |
Interest income |  | $ | 12 |  |  | $ | — |  |  | $ | 242 |  |  | $ | 6 |  |  | $ | 260 |
Interest expense |  | $ | 1,402 |  |  | $ | — |  |  | $ | 248 |  |  | $ | — |  |  | $ | 1,650 |
Income tax expense |  | $ | 33 |  |  | $ | 3 |  |  | $ | 17 |  |  | $ | 10,530 |  |  | $ | 10,583 |
Fiscal Year Ended May 26, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 320,447 |  |  | $ | 78,568 |  |  | $ | 41,281 |  |  | $ | 1,412 |  |  | $ | 441,708 |
International sales |  | $ | 27,532 |  |  | $ | 78,442 |  |  | $ | 26,792 |  |  | $ | — |  |  | $ | 132,766 |
Gross profit |  | $ | 37,077 |  |  | $ | 5,274 |  |  | $ | 19,102 |  |  | $ | 1,307 |  |  | $ | 62,760 |
Net income (loss) |  | $ | 20,526 |  |  | $ | 1,660 |  |  | $ | 6,835 |  |  | $ | (6,434 | ) |  | $ | 22,587 |
Identifiable assets |  | $ | 180,104 |  |  | $ | 21,737 |  |  | $ | 80,940 |  |  | $ | 8,161 |  |  | $ | 290,942 |
Depreciation and amortization |  | $ | 4,761 |  |  | $ | 4 |  |  | $ | 2,379 |  |  | $ | 151 |  |  | $ | 7,295 |
Capital expenditures |  | $ | 5,598 |  |  | $ | — |  |  | $ | 3,190 |  |  | $ | 89 |  |  | $ | 8,877 |
Dividend income |  | $ | 1,125 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,125 |
Interest income |  | $ | 42 |  |  | $ | — |  |  | $ | 137 |  |  | $ | — |  |  | $ | 179 |
Interest expense |  | $ | 1,707 |  |  | $ | — |  |  | $ | 301 |  |  | $ | — |  |  | $ | 2,008 |
Income tax expense |  | $ | 3,399 |  |  | $ | 339 |  |  | $ | 1,400 |  |  | $ | 4,314 |  |  | $ | 9,452 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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