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Note 5 - Goodwill, Intangible Assets and Long Term Assets (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Goodwill [Table Text Block]
   
Battery &
Energy Products
   
Communications
Systems
   
Discontinued
Operations
   
Total
 
                         
Balance at December 31, 2011
  $ 4,838     $ 11,493     $ 2,025     $ 18,356  
                                 
Effect of foreign currency translations
    22       -       -       22  
                                 
Balance at April 1, 2012
    4,860       11,493       2,025       18,378  
                                 
Sale of RedBlack Communications
                    (2,025 )     (2,025 )
Effect of foreign currency Translations
    (9 )     -       -       (9 )
                                 
Balance at December 31, 2012
    4,851       11,493       -       16,344  
                                 
Effect of foreign currency translations
    13       -       -       13  
                                 
Balance at March 31, 2013
  $ 4,864     $ 11,493     $ -     $ 16,357  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
March 31, 2013
 
   
Gross Assets
   
Accumulated
Amortization
   
Net
 
                   
Trademarks
  $ 3,565     $ -     $ 3,565  
Patents and technology
    4,498       3,760       738  
Customer relationships
    4,004       3,412       592  
Distributor relationships
    382       335       47  
Non-compete agreements
    217       217       -  
                         
Total intangible assets
  $ 12,666     $ 7,724     $ 4,942  
   
December 31, 2012
 
   
Gross Assets
   
Accumulated
Amortization
   
Net
 
                   
Trademarks
  $ 3,564     $ -     $ 3,564  
Patents and technology
    4,495       3,702       793  
Customer relationships
    3,998       3,366       632  
Distributor relationships
    380       330       50  
Non-compete agreements
    217       217       -  
                         
Total intangible assets
  $ 12,654     $ 7,615     $ 5,039