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Note 4 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Inventory, Current [Table Text Block]

		December 31,
		201 6				201 5
Raw Materials		$	14,482			$	11,602
Work in Process			986				1,560
Finished Products			7,988				10,652
Total		$	23,456			$	23,814

Property, Plant and Equipment [Table Text Block]

		December 31,
		201 6				201 5
Land		$	123			$	123
Buildings and Leasehold Improvements			7,757				7,490
Machinery and Equipment			49,722				49,609
Furniture and Fixtures			1,947				1,974
Computer Hardware and Software			5,223				4,585
Construction in Progress			421				745
			65,193				64,526
Less – Accumulated Depreciation			(57,194	)			(55,488	)
Total		$	7,999			$	9,038

Schedule of Goodwill [Table Text Block]

		Battery & Energy Products				Communi- cations Systems				Total
Balance – January 1, 2015		$	4,914			$	11,493			$	16,407
Effect of Foreign Currency Translation			(124	)			-				(124	)
Balance – December 31, 2015			4,790				11,493				16,283
Acquisition of Accutronics			4,487				-				4,487
Effect of Foreign Currency Translation			(805	)			-				(805	)
Balance – December 31, 2016		$	8,472			$	11,493			$	19,965

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

		December 31, 201 6
		Cost				Accumulated Amortization				Net
Trademarks		$	3,404			$	-			$	3,404
Customer Relationships			6,395				3,975				2,420
Patents and Technology			5,455				4,417				1,038
Distributor Relationships			377				368				9
Trade Name			359				36				323
Total Other Intangible Assets		$	15,990			$	8,796			$	7,194

		December 31, 201 5
		Cost				Accumulated Amortization				Net
Trademarks		$	3,411			$	-			$	3,411
Patents and Technology			4,482				4,217				265
Customer Relationships			3,971				3,716				255
Distributor Relationships			370				355				15
Total Other Intangible Assets		$	12,234			$	8,288			$	3,946

Finite-lived Intangible Assets Amortization Expense [Table Text Block]

		Year ended December 31,
		201 6				201 5
Research and Development Expense		$	200			$	130
Selling, General and Administrative Expense			303				105
Total		$	503			$	235

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