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Note 4 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		December 31,
		2024				2023
Cash		$	6,854			$	10,196
Restricted cash			-				82
Total		$	6,854			$	10,278

Schedule of Inventory, Current [Table Text Block]

		December 31,
		2024				2023
Raw materials		$	36,035			$	29,098
Work in process			4,501				3,187
Finished products			10,827				9,930
Total		$	51,363			$	42,215

Property, Plant and Equipment [Table Text Block]

		December 31,
		2024				2023
Land		$	4,693			$	1,273
Buildings and leasehold improvements			30,109				15,998
Machinery and equipment			60,986				57,584
Furniture and fixtures			3,067				2,845
Computer hardware and software			7,990				7,868
Construction in progress			2,077				2,033
			108,922				87,601
Less: Accumulated depreciation			(68,437	)			(66,484	)
Total		$	40,485			$	21,117

Schedule of Goodwill [Table Text Block]

		Battery & Energy Products				Communications Systems				Total
Balance – January 1, 2024		$	26,078			$	11,493			$	37,571
Acquisition of Electrochem			7,558				-				7,558
Effect of foreign currency translation			(123	)			-				(123	)
Balance – December 31, 2024		$	33,513			$	11,493			$	45,006

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

		December 31, 2024
		Cost				Accumulated amortization				Net
Customer relationships		$	18,154			$	7,296			$	10,858
Trade names			9,942				813				9,129
Patents and technology			5,690				5,428				262
Trademarks			3,399				-				3,399
Other			1,500				591				909
Total other intangible assets		$	38,685			$	14,128			$	24,557

		December 31, 2023
		Cost				Accumulated amortization				Net
Customer relationships		$	13,092			$	6,656			$	6,436
Trade names			4,647				647				4,000
Patents and technology			5,606				5,322				284
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]

		Year ended December 31,
		2024				2023
Selling, general and administrative expense		$	929			$	792
Research and development expense			103				97
Total		$	1,032			$	889

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