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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 28, 2017 | May 29, 2016 | May 31, 2015
Stock-based compensation expense | $ 3,964 | $ 3,465 | $ 1,577
Cost of Sales [Member] |  |  |
Stock-based compensation expense | 485 | 405 | 142
Research and Development Expense [Member] |  |  |
Stock-based compensation expense | 83 | 90 | 16
Selling, General and Administrative Expenses [Member] |  |  |
Stock-based compensation expense | 3,396 | 2,970 | 1,419
Employee Stock Option [Member] |  |  |
Stock-based compensation expense | 1,230 | 1,352 | 561
Restricted Stock Units (RSUs) [Member] |  |  |
Stock-based compensation expense | $ 2,734 | $ 2,113 | $ 1,016

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