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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
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Aug. 27, 2017 | Aug. 28, 2016
Stock-based compensation expense | $ 950 | $ 807
Cost of Sales [Member] |  |
Stock-based compensation expense | 124 | 113
Research and Development Expense [Member] |  |
Stock-based compensation expense | 20 | 23
Selling, General and Administrative Expenses [Member] |  |
Stock-based compensation expense | 806 | 671
Employee Stock Option [Member] |  |
Stock-based compensation expense | 324 | 291
Restricted Stock Units (RSUs) [Member] |  |
Stock-based compensation expense | $ 626 | $ 516

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