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Note 4 - Supplemental Balance Sheet Information (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		September 30, 2023				December 31, 2022
Cash		$	9,223			$	5,634
Restricted cash			78				79
Total		$	9,301			$	5,713

Schedule of Inventory, Current [Table Text Block]

		September 30, 2023				December 31, 2022
Raw materials		$	31,516			$	29,200
Work in process			4,342				2,757
Finished goods			10,776				9,235
Total		$	46,634			$	41,192

Property, Plant and Equipment [Table Text Block]

		September 30, 2023				December 31, 2022
Land		$	1,273			$	1,273
Buildings and leasehold improvements			15,934				15,572
Machinery and equipment			57,164				63,981
Furniture and fixtures			2,822				2,845
Computer hardware and software			7,807				7,744
Construction in process			1,709				1,245
			86,709				92,660
Less: Accumulated depreciation			(65,543	)			(70,944	)
Property, plant and equipment, net		$	21,166			$	21,716

		Three-month period ended								Nine-month period ended
		September 30, 2023				September 30, 2022				September 30, 2023				September 30, 2022
Depreciation expense		$	760			$	815			$	2,282			$	2,450

Schedule of Goodwill [Table Text Block]

		Battery & Energy Products				Communications Systems				Total
Balance – December 31, 2022		$	25,935			$	11,493			$	37,428
Effect of foreign currency translation			(71	)			-				(71	)
Balance – September 30, 2023		$	25,864			$	11,493			$	37,357

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

		at September 30, 2023
		Cost				Accumulated Amortization				Net
Customer relationships		$	12,989			$	6,451			$	6,538
Patents and technology			5,564				5,260				304
Trade names			4,632				607				4,025
Trademarks			3,399				-				3,399
Other			1,500				496				1,004
Total other intangible assets		$	28,084			$	12,814			$	15,270

		at December 31, 2022
		Cost				Accumulated 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

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

		Three-month period ended								Nine-month period ended
		September 30, 2023				September 30, 2022				September 30, 2023				September 30, 2022
Amortization included in:
Selling, general and administrative		$	203			$	295			$	591			$	895
Research and development			24				23				72				74
Total amortization expense		$	227			$	318			$	663			$	969

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