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Note 9 - Income Taxes - Effective Consolidated Tax Rate (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Sep. 25, 2016
Oct. 01, 2017
Sep. 25, 2016
Income Before Income Taxes     $ 4,226 $ 1,952
Income Tax Provision $ 104 $ 92 $ 370 $ 213
Effective Income Tax Rate     8.80% 10.90%