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Note 5 - Goodwill, Intangible Assets and Long Term Assets (Details) - Goodwill activity by segment (USD $)
In Thousands, unless otherwise specified
1 Months Ended 9 Months Ended
Dec. 31, 2012
Sep. 29, 2013
Sep. 30, 2012
Dec. 31, 2011
Goodwill [Line Items]        
Balance at $ 16,344 $ 16,405 $ 16,337 $ 18,356
Sale of RedBlack Communications     (2,025)  
Effect of foreign currency Translations 7 61 6  
Battery & Energy Products [Member]
       
Goodwill [Line Items]        
Balance at 4,851 4,912 4,844 4,838
Effect of foreign currency Translations 7 61 6  
Communications Systems [Member]
       
Goodwill [Line Items]        
Balance at 11,493 11,493 11,493 11,493
Discontinued Operations [Member]
       
Goodwill [Line Items]        
Balance at       2,025
Sale of RedBlack Communications     $ (2,025)