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Note 4 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		December 31,
		2022				2021
Cash		$	5,634			$	8,329
Restricted cash			79				84
Total		$	5,713			$	8,413

Schedule of Inventory, Current [Table Text Block]

		December 31,
		2022				2021
Raw materials		$	29,200			$	21,660
Work in process			2,757				4,227
Finished products			9,235				7,302
Total		$	41,192			$	33,189

Property, Plant and Equipment [Table Text Block]

		December 31,
		2022				2021
Land		$	1,759			$	1,273
Buildings and leasehold improvements			15,572				15,442
Machinery and equipment			63,495				63,780
Furniture and fixtures			2,845				2,588
Computer hardware and software			7,744				7,579
Construction in progress			1,245				761
			92,660				91,423
Less – Accumulated depreciation			(70,944	)			(68,218	)
Total		$	21,716			$	23,205

Schedule of Goodwill [Table Text Block]

		Battery & Energy Products				Communications Systems				Total
Balance – January 1, 2022		$	26,575			$	11,493			$	38,068
Effect of foreign currency translation			(640	)			-				(640	)
Balance – December 31, 2022		$	25,935			$	11,493			$	37,428

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

		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

		December 31, 2021,
		Cost				Accumulated amortization				Net
Customer relationships		$	13,214			$	5,484			$	7,730
Patents and technology			5,667				5,126				541
Trade names			4,670				436				4,234
Trademarks			3,413				-				3,413
Other			1,490				18				1,472
Total other intangible assets		$	28,454			$	11,064			$	17,390

Finite-Lived Intangible Assets Amortization Expense [Table Text Block]

		Year ended December 31,
		2022				2021
Research and development expense		$	97			$	118
Selling, general and administrative expense			1,185				515
Total		$	1,282			$	633

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