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Note 4 - Stock-Based Compensation - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2016 | Mar. 01, 2015 | Feb. 28, 2016 | Mar. 01, 2015
Employee Stock Option [Member] |  |  |  |
Stock-based Compensation Expense | $ 331 | $ 139 | $ 1,021 | $ 394
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock-based Compensation Expense | 553 | 252 | 1,560 | 745
Research and Development Expense [Member] |  |  |  |
Stock-based Compensation Expense | 59 | 8 | 179 | 28
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based Compensation Expense | 825 | 383 | 2,402 | 1,111
Stock-based Compensation Expense | $ 884 | $ 391 | $ 2,581 | $ 1,139

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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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