Note 5 - Supplemental Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

	June 30,		December 31,
	2022		2021
Cash	$	5,037	$	8,329
Restricted cash		77		84
Total	$	5,114	$	8,413

Schedule of Inventory, Current [Table Text Block]

	June 30,		December 31,
	2022		2021
Raw materials	$	26,209	$	21,660
Work in process		3,526		4,227
Finished goods		9,466		7,302
Total	$	39,201	$	33,189

Property, Plant and Equipment [Table Text Block]

	June 30,			December 31,
	2022			2021
Land	$	1,273		$	1,273
Buildings and leasehold improvements		15,522			15,442
Machinery and equipment		63,930			63,780
Furniture and fixtures		2,756			2,588
Computer hardware and software		7,583			7,579
Construction in process		824			761
		91,888			91,423
Less: Accumulated depreciation		(69,550	)		(68,218	)
Property, plant and equipment, net	$	22,338		$	23,205

	Three-month period ended				Six-month period ended
	June 30,		June 30,		June 30,		June 30,
	2022		2021		2022		2021
Depreciation expense	$	819	$	730	$	1,635	$	1,460

Schedule of Goodwill [Table Text Block]

	Battery & Energy			Communications
	Products			Systems		Total
Balance – December 31, 2021	$	26,575		$	11,493	$	38,068
Measurement period adjustment (1)		(30	)		-		(30	)
Effect of foreign currency translation		(536	)		-		(536	)
Balance – June 30, 2022	$	26,009		$	11,493	$	37,502

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

	at June 30, 2022
			Accumulated
	Cost		Amortization		Net
Customer relationships	$	12,978	$	5,689	$	7,289
Patents and technology		5,560		5,117		443
Trade names		4,631		468		4,163
Trademarks		3,407		-		3,407
Other		1,500		236		1,264
Total other intangible assets	$	28,076	$	11,510	$	16,566

	at December 31, 2021
			Accumulated
	Cost		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]

	Three-month period ended				Six-month period ended
	June 30,		June 30,		June 30,		June 30,
	2022		2021		2022		2021
Amortization included in:
Research and development	$	25	$	33	$	51	$	66
Selling, general and administrative		298		123		600		244
Total amortization expense	$	323	$	156		651	$	310