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Note 5 - Supplemental Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		June 30,				December 31,
		2020				2019
Cash		$	8,298			$	7,135
Restricted cash			91				270
Total		$	8,389			$	7,405

Schedule of Inventory, Current [Table Text Block]

		June 30,				December 31,
		2020				2019
Raw materials		$	17,142			$	18,485
Work in process			3,504				2,548
Finished goods			7,418				8,726
Total		$	28,064			$	29,759

Property, Plant and Equipment [Table Text Block]

		June 30,				December 31,
		2020				2019
Land		$	1,273			$	1,273
Buildings and leasehold improvements			15,337				15,386
Machinery and equipment			54,904				55,058
Furniture and fixtures			2,188				2,194
Computer hardware and software			6,719				6,712
Construction in process			6,109				4,730
			86,530				85,353
Less: Accumulated depreciation			(63,817	)			(62,828	)
Property, plant and equipment, net		$	22,713			$	22,525

		Three-month period ended								Six-month period ended
		June 30,				June 30,				June 30,				June 30,
		2020				2019				2020				2019
Depreciation expense		$	582			$	515			$	1,161			$	962

Schedule of Goodwill [Table Text Block]

		Battery & Energy				Communications
		Products				Systems				Total
Balance – December 31, 2019			15,260				11,493				26,753
Effect of foreign currency translation			(294	)			-				(294	)
Balance – June 30, 2020		$	14,966			$	11,493			$	26,459

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

		June 30, 2020
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,401			$	-			$	3,401
Customer relationships			8,913				4,853				4,060
Patents and technology			5,454				4,902				552
Distributor relationships			377				377				-
Trade name			1,486				249				1,237
Total		$	19,631			$	10,381			$	9,250

		December 31, 2019
						Accumulated
		Cost				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		$	19,892			$	10,171			$	9,721

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

		Three-month period ended								Six-month period ended
		June 30,				June 30,				June 30,				June 30,
		2020				2019				2020				2019
Amortization included in:
Research and development		$	30			$	33			$	61			$	66
Selling, general and administrative			116				99				234				158
Total amortization expense		$	146			$	132			$	295			$	224

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