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Note 3 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		December 31,
		2023				2022
Cash		$	10,196			$	5,634
Restricted cash			82				79
Total		$	10,278			$	5,713

Schedule of Inventory, Current [Table Text Block]

		December 31,
		2023				2022
Raw materials		$	29,098			$	29,200
Work in process			3,187				2,757
Finished products			9,930				9,235
Total		$	42,215			$	41,192

Property, Plant and Equipment [Table Text Block]

		December 31,
		2023				2022
Land		$	1,273			$	1,273
Buildings and leasehold improvements			15,998				15,572
Machinery and equipment			57,584				63,981
Furniture and fixtures			2,845				2,845
Computer hardware and software			7,868				7,744
Construction in progress			2,033				1,245
			87,601				92,660
Less: Accumulated depreciation			(66,484	)			(70,944	)
Total		$	21,117			$	21,716

Schedule of Goodwill [Table Text Block]

		Battery & Energy Products				Communications Systems				Total
Balance – January 1, 2023		$	25,935			$	11,493			$	37,428
Effect of foreign currency translation			143				-				143
Balance – December 31, 2023		$	26,078			$	11,493			$	37,571

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

		December 31, 2023
		Cost				Accumulated 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

		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]

		Year ended December 31,
		2023				2022
Research and development expense		$	97			$	97
Selling, general and administrative expense			792				1,185
Total		$	889			$	1,282

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