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Note 5 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		December 31
		201 9				201 8
Cash		$	7,135			$	25,583
Restricted cash			270				351
Total		$	7,405			$	25,934

Schedule of Inventory, Current [Table Text Block]

		December 31
		2019				2018
Raw materials		$	18,485			$	13,274
Work in process			2,548				2,016
Finished products			8,726				7,553
Total		$	29,759			$	22,843

Property, Plant and Equipment [Table Text Block]

		December 31
		2019				2018
Land		$	1,273			$	123
Buildings and leasehold improvements			8,148				8,267
Machinery and equipment			62,562				51,261
Furniture and fixtures			2,112				2,058
Computer hardware and software			6,528				5,590
Construction in progress			4,730				4,302
			85,353				71,601
Less – Accumulated depreciation			(62,828	)			(60,857	)
Total		$	22,525			$	10,744

Schedule of Goodwill [Table Text Block]

		Battery & Energy Products				Communications Systems				Total
Balance – January 1, 2018		$	8,965			$	11,493			$	20,458
Effect of foreign currency translation			(349	)			-				(349	)
Balance – December 31, 2018			8,616				11,493				20,109
Acquisition of SWE			6,534				-				6,534
Effect of foreign currency translation			110				-				110
Balance – December 31, 2019		$	15,260			$	11,493			$	26,753

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

		December 31, 201 9
		Cost				Accumulated amortization				Net
Trademarks		$	3,403			$	-			$	3,403
Customer relationships			9,080				4,721				4,359
Patents and technology			5,521				4,869				652
Distributor relationships			377				377				-
Trade name			1,511				204				1,307
Total other intangible assets		$	19,892			$	10,171			$	9,721

		December 31, 201 8
		Cost				Accumulated a mortization				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

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

		Year ended December 31
		201 9				2018
Research and development expense		$	130			$	147
Selling, general and administrative expense			395				250
Total		$	525			$	397

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