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Note 3 - Supplemental Balance Sheet Information (Detail) - Goodwill activity (USD $) In Thousands, unless otherwise specified	12 Months Ended							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Battery & Energy Products [Member]	Dec. 31, 2011 Battery & Energy Products [Member]	Dec. 31, 2012 Communications Systems [Member]	Dec. 31, 2011 Communications Systems [Member]	Dec. 31, 2010 Communications Systems [Member]	Dec. 31, 2012 Discontinued Operations [Member]	Dec. 31, 2010 Discontinued Operations [Member]
Balance	$ 18,356	$ 18,276	$ 4,838	$ 4,758	$ 11,493	$ 11,493	$ 11,493	$ 2,025	$ 2,025
Sale of RedBlack
Communications	(2,025)							(2,025)
Effect of foreign currency translations	13	80	13	80
Balance	$ 16,344	$ 18,356	$ 4,851	$ 4,838	$ 11,493	$ 11,493	$ 11,493		$ 2,025

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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