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Note 3 - Stock-based Compensation - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 26, 2017 | Feb. 28, 2016 | Feb. 26, 2017 | Feb. 28, 2016
Stock-based Compensation Expense | $ 1,069 | $ 884 | $ 2,842 | $ 2,581
Cost of Sales [Member] |  |  |  |
Stock-based Compensation Expense | 124 | 103 | 361 | 301
Research and Development Expense [Member] |  |  |  |
Stock-based Compensation Expense | 23 | 22 | 69 | 67
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based Compensation Expense | 922 | 759 | 2,412 | 2,213
Employee Stock Option [Member] |  |  |  |
Stock-based Compensation Expense | 308 | 331 | 907 | 1,021
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock-based Compensation Expense | $ 761 | $ 553 | $ 1,935 | $ 1,560

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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 + Details
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