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Note 4 - Supplemental Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		March 31,				December 31,
		2021				2020
Cash		$	13,574			$	10,562
Restricted cash			88				91
Total		$	13,662			$	10,653

Schedule of Inventory, Current [Table Text Block]

		March 31,				December 31,
		2021				2020
Raw materials		$	16,724			$	17,277
Work in process			3,080				3,411
Finished goods			8,052				7,505
Total		$	27,856			$	28,193

Property, Plant and Equipment [Table Text Block]

		March 31,				December 31,
		2021				2020
Land		$	1,273			$	1,273
Buildings and leasehold improvements			15,396				15,393
Machinery and equipment			61,413				61,048
Furniture and fixtures			2,286				2,235
Computer hardware and software			7,102				6,894
Construction in process			1,420				1,227
			88,890				88,070
Less: Accumulated depreciation			(65,944	)			(65,220	)
Property, plant and equipment, net		$	22,946			$	22,850

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			43				-				43
Balance – March 31, 2021		$	15,568			$	11,493			$	27,061

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

		at March 31, 2021
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,410			$	-			$	3,410
Customer relationships			9,193				5,215				3,978
Patents and technology			5,567				5,051				516
Distributor relationships			377				377				0
Trade name			1,527				354				1,173
Total other intangible assets		$	20,074			$	10,997			$	9,077

		at 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				0
Trade name			1,524				324				1,200
Total other intangible assets		$	20,039			$	10,830			$	9,209

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