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Note 5 - Goodwill and Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Goodwill [Table Text Block]
   
Battery &
Energy Products
   
Communications
Systems
   
Discontinued
Operations
   
Total
 
                         
Balance at December 31, 2010
  $ 4,758     $ 11,493     $ 2,025     $ 18,276  
                                 
Effect of foreign currency translations
    73       -       -       73  
                                 
Balance at October 2, 2011
    4,831       11,493       2,025       18,349  
                                 
Effect of foreign currency translations
    7       -       -       7  
                                 
Balance at December 31, 2011
    4,838       11,493       2,025       18,356  
                                 
Sale of RedBlack Communications
                    (2,025 )     (2,025 )
Effect of foreign currency translations
    6       -       -       6  
                                 
Balance at September 30, 2012
  $ 4,844     $ 11,493     $ -     $ 16,337  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
September 30, 2012
 
   
Gross
Assets
   
Accumulated
Amortization
   
Net
 
                   
Trademarks
  $ 3,564     $ -     $ 3,564  
Patents and technology
    4,493       3,635       858  
Customer relationships
    3,995       3,308       687  
Distributor relationships
    379       324       55  
Non-compete agreements
    216       216       -  
                         
Total intangible assets
  $ 12,647     $ 7,483     $ 5,164  
   
December 31, 2011
 
   
Gross
Assets
   
Accumulated
Amortization
   
Net
 
                   
Trademarks
  $ 3,563     $ -     $ 3,563  
Patents and technology
    4,492       3,440       1,052  
Customer relationships
    3,993       3,143       850  
Distributor relationships
    378       310       68  
Non-compete agreements
    396       396       -  
                         
Total intangible assets
  $ 12,822     $ 7,289     $ 5,533