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Note 9 - Shareholders' Equity - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Stock-based comepensation expense $ 363 $ 133 $ 707 $ 529
Employee Stock Option [Member]        
Stock-based comepensation expense 344 130 653 518
Restricted Stock [Member]        
Stock-based comepensation expense $ 19 $ 3 $ 54 $ 11