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Note 10 - Share-based Compensation Expense Related to Stock Options (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 28, 2014
Sep. 30, 2015
Sep. 28, 2014
Share-based compensation $ 291 $ 67 $ 410 $ 210