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Note 8 - Shareholders' Equity - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Sep. 25, 2016
Oct. 01, 2017
Sep. 25, 2016
Stock-based comepensation expense $ 133 $ 205 $ 529 $ 555
Employee Stock Option [Member]        
Stock-based comepensation expense 130 197 518 525
Restricted Stock [Member]        
Stock-based comepensation expense $ 3 $ 8 $ 11 $ 30