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Note 4 - Supplemental Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		March 31,				December 31,
		2024				2023
Cash		$	10,099			$	10,196
Restricted cash			-				82
Total		$	10,099			$	10,278

Schedule of Inventory, Current [Table Text Block]

		March 31,				December 31,
		2024				2023
Raw materials		$	30,168			$	29,098
Work in process			3,593				3,187
Finished goods			10,060				9,930
Total		$	43,821			$	42,215

Property, Plant and Equipment [Table Text Block]

		March 31,				December 31,
		2024				2023
Land		$	1,273			$	1,273
Buildings and leasehold improvements			16,007				15,998
Machinery and equipment			57,427				57,584
Furniture and fixtures			2,818				2,845
Computer hardware and software			7,770				7,868
Construction in process			1,695				2,033
			86,990				87,601
Less: Accumulated depreciation			(66,320	)			(66,484	)
Property, plant and equipment, net		$	20,670			$	21,117

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			(72	)			-				(72	)
Balance – March 31, 2024		$	26,006			$	11,493			$	37,499

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

		at March 31, 2024
						Accumulated
		Cost				Amortization				Net
Customer relationships		$	13,072			$	6,796			$	6,276
Patents and technology			5,597				5,344				253
Trade names			4,645				673				3,972
Trademarks			3,400				-				3,400
Other			1,500				534				966
Total other intangible assets		$	28,214			$	13,347			$	14,867

		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

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