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Note 6 - Goodwill, Intangible Assets and Long Term Assets (Tables)
 3 Months Ended
Mar. 29, 2015
Note 6 - Goodwill Intangible Assets And Long Term Assets Tables  
Schedule of Goodwill Activity by Segment

       
   Battery &
Energy		  Communi-
cations		   
   Products  Systems  Total
       
Balance - December 31, 2013  $4,926   $11,493   $16,419 
   Effect of foreign currency translation   (20)   —      (20)
Balance – March 30, 2014   4,906    11,493    16,399 
   Effect of foreign currency translation   8    —      8 
Balance - December 31, 2014   4,914    11,493    16,407 
   Effect of foreign currency translation   9    —      9 
Balance – March 29, 2015  $4,923   $11,493   $16,416 
Schedule of Intangible Assets

       
   at March 29, 2015
      Accumulated   
   Cost  amortization  Net
       
Trademarks  $3,568   $—     $3,568 
Patents and technology   4,511    (4,148)   363 
Customer relationships   4,033    (3,709)   324 
Distributor relationships   393    (369)   24 
Total intangible assets  $12,505   $(8,226)  $4,279 
                
   at December 31, 2014
         Accumulated      
    Cost    amortization    Net 
           
Trademarks  $3,567   $—     $3,567 
Patents and technology   4,509    (4,114)   395 
Customer relationships   4,029    (3,679)   350 
Distributor relationships   391    (365)   26 
Total intangible assets  $12,496   $(8,158)  $4,338