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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Stock-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 27, 2018 | May 28, 2017 | May 29, 2016
Stock-based compensation expense | $ 4,403 | $ 3,964 | $ 3,465
Cost of Sales [Member] |  |  |
Stock-based compensation expense | 535 | 485 | 405
Research and Development Expense [Member] |  |  |
Stock-based compensation expense | 131 | 83 | 90
Selling, General and Administrative Expenses [Member] |  |  |
Stock-based compensation expense | 3,737 | 3,396 | 2,970
Employee Stock Option [Member] |  |  |
Stock-based compensation expense | 1,488 | 1,230 | 1,352
Restricted Stock Units (RSUs) [Member] |  |  |
Stock-based compensation expense | $ 2,915 | $ 2,734 | $ 2,113

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