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Note 11 - Segment Information - Reconciliation of Segment Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 30, 2018
Assets $ 1,454,293 $ 1,284,644
Operating Segments [Member]    
Assets 1,406,689  
Corporate, Non-Segment [Member]    
Assets $ 47,604