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Note 8 - Fair Value of Assets and Liabilities (Tables)
3 Months Ended
Mar. 30, 2013
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Fair Value Measurements Using
       
   
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
  $ 11,572     $     $     $ 11,572  
Total
  $ 11,572     $     $     $ 11,572  
   
Fair Value Measurements Using
       
   
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
  $ 10,327     $     $     $ 10,327  
Investment in unconsolidated affiliate
                8,666       8,666  
Total
  $ 10,327     $     $ 8,666     $ 18,993