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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
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Aug. 28, 2016 | Aug. 30, 2015
Employee Stock Option [Member] |  |
Stock-based Compensation Expense | $ 291 | $ 330
Restricted Stock Units (RSUs) [Member] |  |
Stock-based Compensation Expense | 516 | 467
Cost of Sales [Member] |  |
Stock-based Compensation Expense | 113 | 98
Research and Development Expense [Member] |  |
Stock-based Compensation Expense | 23 | 22
Selling, General and Administrative Expenses [Member] |  |
Stock-based Compensation Expense | 671 | 677
Stock-based Compensation Expense | $ 807 | $ 797

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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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