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Note 20 - Quarterly Data and Share Information (Unaudited) (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2018
Sep. 30, 2018
Jul. 01, 2018
Dec. 31, 2017
Apr. 02, 2017
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Business Combination, Acquisition Related Costs $ 1,200 $ 2,400 $ 5,800          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles 11,800 $ 20,300            
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) 6,700              
Restructuring Costs and Asset Impairment Charges, Total $ 20,500       $ 7,300      
Tax Adjustments, Settlements, and Unusual Provisions       $ 15,200   $ (6,739) $ 15,174 $ 0