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Note 5 - Fair Value of Assets and Liabilities (Tables)
 3 Months Ended
Apr. 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
   $
11,660
     $
—
     $
—
     $
11,660
  
 
 
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]
 
 
April 1, 2017
 
 
December 31, 2016
 
(in
thousands
)
 
Carrying
Value
 
 
Estimated Fair
Value
 
 
Carrying
Value
 
 
Estimated
Fair
Value
 
Euro Senior Notes, Series A due 2023
   $
125,616
     $
125,251
     $
122,313
     $
122,586
  
Euro Senior Notes, Series B due 2028
    
101,996
      
101,037
      
99,314
      
99,230
  
USD Senior Notes, Series A due 2022
    
25,000
      
24,817
      
—
      
—
  
USD Senior Notes, Series B due 2027
    
100,000
      
99,208
      
—
      
—