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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
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