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Note 4 - Debt (Tables)
 6 Months Ended
Jul. 01, 2017
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
(in
thousands
)
  
July 1, 2017
    
December 31, 2016
  
Revolving credit facility
   $
—
     $
112,500
  
Term loan
    
117,188
      
120,313
  
Entrusted loan
    
1,179
      
3,522
  
Euro Senior Notes, Series A due 2023
    
133,497
      
122,313
  
Euro Senior Notes, Series B due 2028
    
108,395
      
99,314
  
USD Senior Notes, Series A due 2022
    
25,000
      
—
  
USD Senior Notes, Series B due 2027
    
100,000
      
—
  
Unamortized debt issuance costs
    
(3,567
 )    
(3,820
 )
Total debt
    
481,692
      
454,142
  
Less: Current maturities
    
(7,813
 )    
(6,250
 )
Total long-term debt
   $
473,879
     $
447,892