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Note 12 - Segment Information (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Number of Operating Segments     3  
Asset Impairment Charges, Total     $ 1,125
Other Segments [Member] | Operating Income (Loss) [Member]        
Business Combination, Acquisition Related Costs $ 24,400 $ 300 63,200 $ 1,800
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory 19,000   36,900  
Business Combination, Acquisition Related Costs and Integration Costs, Legal, Accounting and Other Expenses 2,300   14,100  
Business Combination, Backlog Amortization Costs 3,100   5,600  
Business Combination, Share-based Compensation     4,500  
Business Combination, Other Expenses     2,100  
Restructuring Charges, Total 3,200   3,900  
Asset Impairment Charges, Total $ 1,100      
Other Asset Impairment Charges     $ 1,100