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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) $ in Thousands | 12 Months Ended
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May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Employee Stock Option [Member] |  |  |
Stock-based compensation expense | $ 561 | $ 558 | $ 788
Restricted Stock Units (RSUs) [Member] |  |  |
Stock-based compensation expense | 1,016 | 798 | 907
Research and Development Expense [Member] |  |  |
Stock-based compensation expense | 38 | 39 | 718
Selling, General and Administrative Expenses [Member] |  |  |
Stock-based compensation expense | 1,539 | 1,317 | 977
Stock-based compensation expense | $ 1,577 | $ 1,356 | $ 1,695

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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