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Note 5 - Income Taxes (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Effective Income Tax Rate Reconciliation, Percent 33.40% 34.20% 35.50% 42.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     34.00%