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Note 3 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		December 31,				December 31,
		2018				2017
Cash		$	25,583			$	18,241
Restricted Cash			351				89
Total		$	25,934			$	18,330

Schedule of Inventory, Current [Table Text Block]

		December 31,
		2018				2017
Raw Materials		$	13,274			$	14,606
Work in Process			2,016				2,013
Finished Products			7,553				9,707
Total		$	22,843			$	26,326

Property, Plant and Equipment [Table Text Block]

		December 31,
		2018				2017
Land		$	123			$	123
Buildings and Leasehold Improvements			8,267				7,858
Machinery and Equipment			51,261				50,852
Furniture and Fixtures			2,058				2,005
Computer Hardware and Software			5,590				5,338
Construction in Progress			4,302				535
			71,601				66,711
Less – Accumulated Depreciation			(60,857	)			(59,141	)
Total		$	10,744			$	7,570

Schedule of Goodwill [Table Text Block]

		Battery & Energy Products				Communi- cations Systems				Total
Balance – January 1, 2017		$	8,472			$	11,493			$	19,965
Effect of Foreign Currency Translation			493				-				493
Balance – December 31, 2017			8,965				11,493				20,458
Effect of Foreign Currency Translation			(349	)			-				(349	)
Balance – December 31, 2018		$	8,616			$	11,493			$	20,109

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

		December 31, 2018
		Cost				Accumulated 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

		December 31, 2017
		Cost				Accumulated Amortization				Net
Trademarks		$	3,411			$	-			$	3,411
Customer Relationships			6,618				4,208				2,410
Patents and Technology			5,545				4,595				950
Distributor Relationships			377				377				-
Trade Name			393				79				314
Total Other Intangible Assets		$	16,344			$	9,259			$	7,085

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

		Year ended December 31,
		2018				2017
Research and Development Expense		$	147			$	165
Selling, General and Administrative Expense			250				257
Total		$	397			$	422

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