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Note 6 - Supplemental Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		March 31,					December 31,
		201 9					201 8
Cash			$20,929					$25,583
Restricted Cash			311					351
Total			$21,240					$25,934

Schedule of Inventory, Current [Table Text Block]

		March 31,				December 31,
		2019				2018
Raw Materials		$	17,201			$	13,274
Work In Process			2,067				2,016
Finished Goods			8,638				7,553
Total		$	27,906			$	22,843

Property, Plant and Equipment [Table Text Block]

		March 3 1 ,				December 31,
		201 9				201 8
Land		$	123			$	123
Buildings and Leasehold Improvements			8,284				8,267
Machinery and Equipment			51,772				51,261
Furniture and Fixtures			2,073				2,058
Computer Hardware and Software			5,889				5,590
Construction In Process			5,478				4,302
			73,619				71,601
Less: Accumulated Depreciation			(61,221	)			(60,857	)
Property, Equipment and Improvements, Net		$	12,398			$	10,744

Schedule of Goodwill [Table Text Block]

		Battery & Energy				Communi- cations
		Products				Systems				Total
Balance - December 31, 2017		$	8,965			$	11,493			$	20,458
Effect of Foreign Currency Translation			240				-				240
Balance – April 1, 2018			9,205				11,493				20,698
Effect of Foreign Currency Translation			(589	)			-				(589	)
Balance - December 31, 2018			8,616				11,493				20,109
Effect of Foreign Currency Translation			142				-				142
Balance – March 31, 2019		$	8,758			$	11,493			$	20,251

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

		at March 31, 2019
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,407			$	-			$	3,407
Customer Relationships			6,530				4,453				2,077
Patents and Technology			5,510				4,766				744
Distributor Relationships			377				377				-
Trade Name			379				123				256
Total Other Intangible Assets		$	16,203			$	9,719			$	6,484

		at December 31, 201 8
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,405			$	-			$	3,405
Customer Relationships			6,471				4,392				2,079
Patents and Technology			5,486				4,725				761
Distributor Relationships			377				377				-
Trade Name			370				111				259
Total Other Intangible Assets		$	16,109			$	9,605			$	6,504

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