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Note 10 - Income Taxes - Effective Consolidated Tax Rate (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Income Before Income Taxes     $ 5,461,000 $ 4,226,000
Income Tax Provision $ 86,000 $ 104,000 $ 219,000 $ 370,000
Effective Income Tax Rate     4.00% 8.80%