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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 29, 2016 | May 31, 2015 | May 25, 2014
Employee Stock Option [Member] |  |  |
Stock-based compensation expense | $ 1,352 | $ 561 | $ 558
Restricted Stock Units (RSUs) [Member] |  |  |
Stock-based compensation expense | 2,113 | 1,016 | 798
Research and Development Expense [Member] |  |  |
Stock-based compensation expense | 241 | 38 | 39
Selling, General and Administrative Expenses [Member] |  |  |
Stock-based compensation expense | 3,224 | 1,539 | 1,317
Stock-based compensation expense | $ 3,465 | $ 1,577 | $ 1,356

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