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Note 4 - Supplemental Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		June 30,				December 31,
		2023				2022
Cash		$	8,202			$	5,634
Restricted cash			81				79
Total		$	8,283			$	5,713

Schedule of Inventory, Current [Table Text Block]

		June 30,				December 31,
		2023				2022
Raw materials		$	32,496			$	29,200
Work in process			4,125				2,757
Finished goods			9,442				9,235
Total		$	46,063			$	41,192

Property, Plant and Equipment [Table Text Block]

		June 30,				December 31,
		2023				2022
Land		$	1,273			$	1,273
Buildings and leasehold improvements			15,569				15,572
Machinery and equipment			64,044				63,981
Furniture and fixtures			2,791				2,845
Computer hardware and software			7,798				7,744
Construction in process			1,847				1,245
			93,322				92,660
Less: Accumulated depreciation			(72,200	)			(70,944	)
Property, plant and equipment, net		$	21,122			$	21,716

		Three-month period ended								Six-month period ended
		June 30,				June 30,				June 30,				June 30,
		2023				2022				2023				2022
Depreciation expense		$	760			$	819			$	1,522			$	1,635

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			73				-				73
Balance – June 30, 2023		$	26,008			$	11,493			$	37,501

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

		at June 30, 2023
						Accumulated
		Cost				Amortization				Net
Customer relationships		$	13,079			$	6,346			$	6,733
Patents and technology			5,600				5,259				341
Trade names			4,645				589				4,056
Trademarks			3,399				-				3,399
Other			1,500				477				1,023
Total other intangible assets		$	28,223			$	12,671			$	15,552

		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

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,
		2023				2022				2023				2022
Amortization included in:
Selling, general and administrative		$	203			$	298			$	388			$	600
Research and development			24				25				48				51
Total amortization expense		$	227			$	323			$	436			$	651

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