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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 | 6 Months Ended
--- | --- | ---
Nov. 26, 2017 | Nov. 27, 2016 | Nov. 26, 2017 | Nov. 27, 2016
Stock-based compensation expense | $ 1,116 | $ 966 | $ 2,066 | $ 1,773
Cost of Sales [Member] |  |  |  |
Stock-based compensation expense | 137 | 124 | 261 | 237
Research and Development Expense [Member] |  |  |  |
Stock-based compensation expense | 23 | 23 | 42 | 46
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation expense | 956 | 819 | 1,763 | 1,490
Employee Stock Option [Member] |  |  |  |
Stock-based compensation expense | 354 | 307 | 678 | 599
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock-based compensation expense | $ 762 | $ 659 | $ 1,388 | $ 1,174

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