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Note 4 - Supplemental Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		March 31,				December 31,
		2023				2022
Cash		$	5,524			$	5,634
Restricted cash			81				79
Total		$	5,605			$	5,713

Schedule of Inventory, Current [Table Text Block]

		March 31,				December 31,
		2023				2022
Raw materials		$	32,960			$	29,200
Work in process			4,594				2,757
Finished goods			9,757				9,235
Total		$	47,311			$	41,192

Property, Plant and Equipment [Table Text Block]

		March 31,				December 31,
		2023				2022
Land		$	1,273			$	1,273
Buildings and leasehold improvements			15,605				15,572
Machinery and equipment			64,132				63,981
Furniture and fixtures			2,825				2,845
Computer hardware and software			7,687				7,744
Construction in process			1,642				1,245
			93,164				92,660
Less: Accumulated depreciation			(71,752	)			(70,944	)
Property, plant and equipment, net		$	21,412			$	21,716

Schedule of Goodwill [Table Text Block]

		Battery &
		Energy				Communications
		Products				Systems				Total
Balance – December 31, 2022		$	25,935			$	11,493			$	37,428
Effect of foreign currency translation			90				-				90
Balance – March 31, 2023		$	26,025			$	11,493			$	37,518

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

		at March 31, 2023
						Accumulated
		Cost				Amortization				Net
Customer relationships		$	13,021			$	6,166			$	6,855
Patents and technology			5,577				5,214				363
Trade names			4,637				555				4,082
Trademarks			3,405				-				3,405
Other			1,500				458				1,042
Total other intangible assets		$	28,140			$	12,393			$	15,747

		at December 31, 2022
						Accumulated
		Cost				Amortization				Net
Customer relationships		$	12,970			$	5,992			$	6,978
Patents and technology			5,557				5,171				386
Trade names			4,629				522				4,107
Trademarks			3,404				-				3,404
Other			1,500				454				1,046
Total other intangible assets		$	28,060			$	12,139			$	15,921

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