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Note 3 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Inventory, Current [Table Text Block]

		December 31,
		2012				2011
Raw materials		$	15,023			$	20,097
Work in process			4,863				4,770
Finished products			10,484				10,100
			30,370			$	34,967

Property, Plant and Equipment [Table Text Block]

		December 31,
		2012				2011
Land		$	123			$	123
Buildings and Leasehold Improvements			7,381				7,000
Machinery and Equipment			46,606				44,770
Furniture and Fixtures			1,810				1,894
Computer Hardware and Software			4,103				3,815
Construction in Progress			1,275				641
			61,298				58,243
Less:  Accumulated Depreciation			48,883				45,655
		$	12,415			$	12,588

Schedule of Goodwill [Table Text Block]

		Battery &				Communications				Discontinued
		Energy Products				Systems				Operations				Total
Balance at December 31, 2010		$	4,758			$	11,493			$	2,025			$	18,276
Effect of foreign currency translations			80				-				-				80
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			13				-				-				13
Balance at December 31, 2012		$	4,851			$	11,493			$	-			$	16,344

Schedule of Finite-Lived Intangible Assets [Table Text Block]

		December 31, 2012
						Accumulated
		Gross Assets				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

		December 31, 2011
						Accumulated
		Gross Assets				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

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