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Note 11 - Share-based Compensation (Details) - Share-based Compensation Expense Related to Stock Options - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Share-based Compensation Expense Related to Stock Options [Abstract]        
Total cost of share-based payment plans $ 59 $ 72 $ 119 $ 143