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Note 3 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure Text Block Supplement [Abstract]

Schedule of Inventory, Current [Table Text Block]

		December 31,
		2013				2012
Raw materials		$	16,239			$	15,023
Work in process			2,412				4,863
Finished products			7,402				10,484
		$	26,053			$	30,370

Property, Plant and Equipment [Table Text Block]

		December 31,
		2013				2012
Land		$	123			$	123
Buildings and Leasehold Improvements			7,412				7,381
Machinery and Equipment			47,405				46,606
Furniture and Fixtures			1,866				1,810
Computer Hardware and Software			4,247				4,103
Construction in Progress			1,073				1,275
			62,126				61,298
Less:  Accumulated Depreciation			51,924				48,883
		$	10,202			$	12,415

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
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
Effect of foreign currency translations			75				-				-				75
Balance at December 31, 2013		$	4,926			$	11,493			$	-			$	16,419

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

		December 31, 2013
		Gross Assets				Accumulated Amortization				Net
Trademarks		$	3,568			$	-			$	3,568
Patents and technology			4,511				3,941				570
Customer relationships			4,033				3,562				471
Distributor relationships			393				356				37
Non-compete agreements			218				218				-
Total intangible assets		$	12,723			$	8,077			$	4,646

		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

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