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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. 25, 2018 | Feb. 26, 2017 | Feb. 25, 2018 | Feb. 26, 2017
Stock-based compensation expense | $ 1,147 | $ 1,069 | $ 3,212 | $ 2,842
Cost of Sales [Member] |  |  |  |
Stock-based compensation expense | 137 | 124 | 398 | 361
Research and Development Expense [Member] |  |  |  |
Stock-based compensation expense | 41 | 23 | 82 | 69
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation expense | 969 | 922 | 2,732 | 2,412
Employee Stock Option [Member] |  |  |  |
Stock-based compensation expense | 380 | 308 | 1,057 | 907
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock-based compensation expense | $ 762 | $ 761 | $ 2,155 | $ 1,935

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