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Note 4 - Supplemental Balance Sheet Information (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		September 30,				December 31,
		2021				2020
Cash		$	15,766			$	10,562
Restricted cash			87				91
Total		$	15,853			$	10,653

Schedule of Inventory, Current [Table Text Block]

		September 30,				December 31,
		2021				2020
Raw materials		$	16,955			$	17,277
Work in process			3,485				3,411
Finished goods			7,739				7,505
Total		$	28,179			$	28,193

Property, Plant and Equipment [Table Text Block]

		September 30,				December 31,
		2021				2020
Land		$	1,273			$	1,273
Buildings and leasehold improvements			15,425				15,393
Machinery and equipment			62,449				61,048
Furniture and fixtures			2,503				2,235
Computer hardware and software			7,316				6,894
Construction in process			1,456				1,227
			90,422				88,070
Less: Accumulated depreciation			(67,387	)			(65,220	)
Property, plant and equipment, net		$	23,035			$	22,850

		Three-month period ended								Nine-month period ended
		September 30,				September 30,				September 30,				September 30,
		2021				2020				2021				2020
Depreciation expense		$	700			$	582			$	2,160			$	1,743

Schedule of Goodwill [Table Text Block]

		Battery & Energy				Communications
		Products				Systems				Total
Balance – December 31, 2020		$	15,525			$	11,493			$	27,018
Effect of foreign currency translation			(20	)			-				(20	)
Balance – September 30, 2021		$	15,505			$	11,493			$	26,998

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

		September 30, 2021
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,412			$	-			$	3,412
Customer relationships			9,133				5,377				3,756
Patents and technology			5,542				5,097				445
Distributor relationships			377				377				-
Trade name			1,519				407				1,112
Total		$	19,983			$	11,258			$	8,725

		December 31, 2020
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,410			$	-			$	3,410
Customer relationships			9,171				5,115				4,056
Patents and technology			5,557				5,014				543
Distributor relationships			377				377				-
Trade name			1,524				324				1,200
Total		$	20,039			$	10,830			$	9,209

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

		Three-month period ended								Nine-month period ended
		September 30,				September 30,				September 30,				September 30,
		2021				2020				2021				2020
Amortization included in:
Research and development		$	27			$	31			$	93			$	92
Selling, general and administrative			121				118				365				352
Total amortization expense		$	148			$	149			$	458			$	444

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