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Note 6 - Supplemental Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		June 30,				December 31,
		2019				2018
Cash		$	6,528			$	25,583
Restricted cash			288				351
Total		$	6,816			$	25,934

Schedule of Inventory, Current [Table Text Block]

		June 30,				December 31 ,
		2019				2018
Raw materials		$	18,379			$	13,274
Work in process			2,679				2,016
Finished goods			13,257				7,553
Total		$	34,315			$	22,843

Property, Plant and Equipment [Table Text Block]

		June 30,				December 31,
		201 9				201 8
Land		$	1,273			$	123
Buildings and leasehold improvements			15,285				8,267
Machinery and equipment			53,774				51,261
Furniture and fixtures			2,177				2,058
Computer hardware and software			6,120				5,590
Construction in process			5,036				4,302
			83,665				71,601
Less: Accumulated depreciation			(61,587	)			(60,857	)
Property, equipment and improvements, net		$	22,078			$	10,744

		Three-month period ended								Six-month period ended
		June 30,				July 1,				June 30,				July 1,
		2019				2018				2019				2018
Depreciation expense		$	515			$	496			$	962			$	980

Schedule of Goodwill [Table Text Block]

		Battery & Energy				Communi- cations
		Products				Systems				Total
Balance - December 31, 2017		$	8,965			$	11,493			$	20,458
Effect of foreign currency translation			(136	)			-				(136	)
Balance – July 1, 2018			8,829				11,493				20,322
Effect of foreign currency translation			(213	)			-				(213	)
Balance - December 31, 2018			8,616				11,493				20,109
Acquisition of SWE			6,474				-				6,474
Effect of foreign currency translation			(9	)			-				(9	)
Balance – June 30, 2019		$	15,081			$	11,493			$	26,574

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

		at June 30 , 2019
						Accumulated
		Cost				Amortization				Net
Trademarks		$	3,405			$	-			$	3,405
Customer relationships			8,986				4,509				4,477
Patents and technology			5,483				4,789				694
Distributor relationships			377				377				-
Trade name			1,497				141				1,356
Total		$	19,748			$	9,816			$	9,932

		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								Six-month period ended
		June 30,				July 1,				June 30,				July 1,
		2019				2018				2019				2018
Amortization included in:
Research and development		$	33			$	37			$	66			$	75
Selling, general and administrative			99				64				158				128
Total amortization expense		$	132			$	101			$	224			$	203

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