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Note 4 - Supplemental Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2024

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		June 30,				December 31,
		2024				2023
Cash		$	6,690			$	10,196
Restricted cash			-				82
Total		$	6,690			$	10,278

Schedule of Inventory, Current [Table Text Block]

		June 30,				December 31,
		2024				2023
Raw materials		$	29,848			$	29,098
Work in process			3,185				3,187
Finished goods			8,359				9,930
Total		$	41,392			$	42,215

Property, Plant and Equipment [Table Text Block]

		June 30,				December 31,
		2024				2023
Land		$	1,273			$	1,273
Buildings and leasehold improvements			16,064				15,998
Machinery and equipment			57,494				57,584
Furniture and fixtures			2,809				2,845
Computer hardware and software			7,816				7,868
Construction in process			1,846				2,033
			87,302				87,601
Less: Accumulated depreciation			(67,021	)			(66,484	)
Property, plant and equipment, net		$	20,281			$	21,117

		Three-month period ended								Six-month period ended
		June 30,				June 30,				June 30,				June 30,
		2024				2023				2024				2023
Depreciation expense		$	789			$	760			$	1,529			$	1,522

Schedule of Goodwill [Table Text Block]

		Battery & Energy				Communications
		Products				Systems				Total
Balance – December 31, 2023		$	26,078			$	11,493			$	37,571
Effect of foreign currency translation			(61	)			-				(61	)
Balance – June 30, 2024		$	26,017			$	11,493			$	37,510

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

		at June 30, 2024
						Accumulated
		Cost				Amortization				Net
Customer relationships		$	13,087			$	6,956			$	6,131
Patents and technology			5,603				5,378				225
Trade names			4,647				703				3,944
Trademarks			3,399				-				3,399
Other			1,500				553				947
Total other intangible assets		$	28,236			$	13,590			$	14,646

		at December 31, 2023
						Accumulated
		Cost				Amortization				Net
Customer relationships		$	13,092			$	6,656			$	6,436
Patents and technology			5,606				5,322				284
Trade names			4,647				647				4,000
Trademarks			3,402				-				3,402
Other			1,500				515				985
Total other intangible assets		$	28,247			$	13,140			$	15,107

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,
		2024				2023				2024				2023
Amortization included in:
Selling, general and administrative		$	202			$	203			$	405			$	388
Research and development			25				24				50				48
Total amortization expense		$	227			$	227			$	455			$	436

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