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Note 6 - Supplemental Balance Sheet Information (Tables)

9 Months Ended

Sep. 29, 2019

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		September 29 ,				December 31,
		2019				2018
Cash		$	6,824			$	25,583
Restricted cash			265				351
Total		$	7,089			$	25,934

Schedule of Inventory, Current [Table Text Block]

		September 29,				December 31,
		2019				2018
Raw materials		$	19,004			$	13,274
Work in process			2,998				2,016
Finished goods			10,394				7,553
Total		$	32,396			$	22,843

Property, Plant and Equipment [Table Text Block]

		September 29,				December 31,
		2019				2018
Land		$	1,273			$	123
Buildings and leasehold improvements			15,257				8,267
Machinery and equipment			54,530				51,261
Furniture and fixtures			2,176				2,058
Computer hardware and software			6,672				5,590
Construction in process			4,757				4,302
			84,665				71,601
Less: Accumulated depreciation			(62,066	)			(60,857	)
Property, equipment and improvements, net		$	22,599			$	10,744

		Three-month period ended								Nine -month period ended
		September 29 ,				September 30 ,				September 29 ,				September 30 ,
		2019				2018				2019				2018
Depreciation expense		$	586			$	496			$	1,548			$	1,476

Schedule of Goodwill [Table Text Block]

		Battery & Energy				Communications
		Products				Systems				Total
Balance – December 31, 2017		$	8,965			$	11,493			$	20,458
Effect of foreign currency translation			(257	)			-				(257	)
Balance – September 30, 2018			8,708				11,493				20,201
Effect of foreign currency translation			(92	)			-				(92	)
Balance – December 31, 2018			8,616				11,493				20,109
Acquisition of SWE			6,474				-				6,474
Effect of foreign currency translation			(210	)			-				(210	)
Balance – September 29, 2019		$	14,880			$	11,493			$	26,373

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

		at September 29 , 2019
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,401			$	-			$	3,401
Customer relationships			8,907				4,586				4,321
Patents and technology			5,452				4,810				642
Distributor relationships			377				377				-
Trade name			1,485				166				1,319
Total		$	19,622			$	9,939			$	9,683

		at December 31, 201 8
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,405			$	-			$	3,405
Customer relationships			6,471				4,392				2,079
Patents and technology			5,486				4,725				761
Distributor relationships			377				377				-
Trade name			370				111				259
Total		$	16,109			$	9,605			$	6,504

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

										Annual
						Estimated				Estimated
		Estimated Fair				Useful Lives				Amortization
		Value				in Years				Expense
Customer relationships		$	2,522				15			$	168
Trade name			1,127				15				75
Total		$	3,649							$	243

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

		Three-month period ended								Nine -month period ended
		September 29 ,				September 30 ,				September 29 ,				September 30 ,
		2019				2018				2019				2018
Amortization included in:
Research and development		$	32			$	36			$	98			$	111
Selling, general and administrative			116				61				274				189
Total amortization expense		$	148			$	97			$	372			$	300

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