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Note 5 - Fair Value of Assets and Liabilities (Tables)
 6 Months Ended
Jul. 01, 2017
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Fair Value Measurements Using
    
 
 
 
(in
thousands
)
  
Quoted
Prices in
Active Markets for
Identical Assets
(Level 1)
    
Significant
Other
Observable
Inputs
(Level 2)
    
Significant
Unobservable
Inputs
(Level 3)
    
Total
  
Investment in Polytronics
   $
11,916
     $
—
     $
—
     $
11,916
  
   
Fair Value Measurements Using
    
 
 
 
(in
thousands
)
  
Quoted
Prices in
Active Markets for
Identical Assets
(Level 1)
    
Significant
Other
Observable
Inputs
(Level 2)
    
Significant
Unobservable
Inputs
(Level 3)
    
Total
  
Investment in Polytronics
   $
10,435
     $
—
     $
—
     $
10,435
  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
July
1, 2017
    
December 31, 2016
  
(in
thousands
)
  
Carrying
Value
    
Estimated
Fair Value
    
Carrying
Value
    
Estimated
Fair
Value
  
Euro Senior Notes, Series A due 2023
   $
133,497
     $
132,037
     $
122,313
     $
122,586
  
Euro Senior Notes, Series B due 2028
    
108,395
      
105,505
      
99,314
      
99,230
  
USD Senior Notes, Series A due 2022
    
25,000
      
24,928
      
—
      
—
  
USD Senior Notes, Series B due 2027
    
100,000
      
99,890
      
—
      
—