Note 13 - Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended March 31,
	2021			2020
Net Revenues:
Thermal	$	11,055		$	9,334
EMS		8,501			1,896
	$	19,556		$	11,230
Earnings (loss) before income tax expense (benefit):
Thermal	$	103		$	(426	)
EMS		2,620			(1,004	)
Corporate		(145	)		37
	$	2,578		$	(1,393	)
Net earnings (loss):
Thermal	$	88		$	(350	)
EMS		2,248			(824	)
Corporate		(124	)		31
	$	2,212		$	(1,143	)

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended March 31,
	2021		2020
Net revenues:
U.S.	$	5,747	$	5,719
Foreign		13,809		5,511
	$	19,556	$	11,230

Long-lived Assets by Geographic Areas [Table Text Block]

	March 31, 2021		December 31, 2020
Property and equipment:
U.S.	$	2,245	$	2,053
Foreign		293		297
	$	2,538	$	2,350

Asset [Member]

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	March 31, 2021		December 31, 2020
Identifiable assets:
Thermal	$	52,096	$	50,782
EMS		13,671		9,667
Corporate		1,359		1,581
	$	67,126	$	62,030