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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 | 6 Months Ended
--- | --- | ---
Nov. 27, 2016 | Nov. 29, 2015 | Nov. 27, 2016 | Nov. 29, 2015
Stock-based Compensation Expense | $ 966 | $ 900 | $ 1,773 | $ 1,697
Cost of Sales [Member] |  |  |  |
Stock-based Compensation Expense | 124 | 100 | 237 | 198
Research and Development Expense [Member] |  |  |  |
Stock-based Compensation Expense | 23 | 23 | 46 | 45
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based Compensation Expense | 819 | 777 | 1,490 | 1,454
Employee Stock Option [Member] |  |  |  |
Stock-based Compensation Expense | 307 | 360 | 599 | 690
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock-based Compensation Expense | $ 659 | $ 540 | $ 1,174 | $ 1,007

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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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