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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 01, 2015
Oct. 01, 2014
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
CHP [Member]            
Payments to Acquire Businesses, Net of Cash Acquired $ 74,710          
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill 81,726          
Goodwill $ 30,076          
MAC Inc. [Member]            
Payments to Acquire Businesses, Net of Cash Acquired   $ 55,690        
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill   49,378        
Goodwill   $ 25,898        
Increase (Decrease) in Intangible Assets, Non-current     $ (4,229)      
Goodwill, Period Increase (Decrease)     2,481      
Payments to Acquire Businesses, Net of Cash Acquired       $ 74,477 $ 5,309  
Goodwill     $ 668,122 $ 668,122   $ 635,565