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Note 5 - Goodwill and Intangible Assets (Detail) - Goodwill activity by segment (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Dec. 31, 2011
Sep. 30, 2012
Oct. 02, 2011
Dec. 31, 2011
Battery & Energy Products [Member]
Sep. 30, 2012
Battery & Energy Products [Member]
Oct. 02, 2011
Battery & Energy Products [Member]
Sep. 30, 2012
Communications Systems [Member]
Dec. 31, 2011
Communications Systems [Member]
Oct. 02, 2011
Communications Systems [Member]
Dec. 31, 2010
Communications Systems [Member]
Sep. 30, 2012
Discontinued Operations [Member]
Oct. 02, 2011
Discontinued Operations [Member]
Dec. 31, 2010
Discontinued Operations [Member]
Balance $ 18,349 $ 18,356 $ 18,276 $ 4,831 $ 4,838 $ 4,758 $ 11,493 $ 11,493 $ 11,493 $ 11,493 $ 2,025 $ 2,025 $ 2,025
Sale of RedBlack Communications   (2,025)                 (2,025)    
Effect of foreign currency translations 7 6 73 7 6 73              
Balance $ 18,356 $ 16,337 $ 18,349 $ 4,838 $ 4,844 $ 4,831 $ 11,493 $ 11,493 $ 11,493 $ 11,493   $ 2,025 $ 2,025