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Note 8 - Shareholders' Equity - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2017
Jun. 26, 2016
Jul. 02, 2017
Jun. 26, 2016
Stock-based comepensation expense $ 356 $ 169 $ 396 $ 350
Employee Stock Option [Member]        
Stock-based comepensation expense 352 158 388 328
Restricted Stock [Member]        
Stock-based comepensation expense $ 4 $ 11 $ 8 $ 22