Note 11 - Segment Information (Tables)

9 Months Ended

Sep. 30, 2016

Asset [Member]

Notes Tables

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

	Sept. 30, 2016		Dec. 31, 2015
Identifiable assets:
Thermal Products	$	18,512	$	16,983
Mechanical Products		19,156		19,733
Electrical Products		4,364		3,268
	$	42,032	$	39,984

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

	Three Months Ended Sept. 30,						Nine Months Ended Sept. 30,
Net revenues:	2016			2015			2016			2015
Thermal Products	$	6,641		$	6,259		$	17,429		$	18,635
Mechanical Products		2,118			1,273			6,727			6,195
Electrical Products		2,064			1,671			5,799			6,120
	$	10,823		$	9,203		$	29,955		$	30,950
Earnings (loss) before income tax expense (benefit):
Thermal Products	$	1,402		$	1,165		$	2,709		$	3,731
Mechanical Products		63			(759	)		4			(1,240	)
Electrical Products		311			79			729			875
Corporate		(55	)		(78	)		(848	)		(629	)
	$	1,721		$	407		$	2,594		$	2,737
Net earnings (loss):
Thermal Products	$	888		$	886		$	1,737		$	2,559
Mechanical Products		40			(577	)		1			(891	)
Electrical Products		196			60			468			579
Corporate		(34	)		(59	)		(549	)		(419	)
	$	1,090		$	310		$	1,657		$	1,828

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

	Three Months Ended Sept. 30,				Nine Months Ended Sept. 30,
	2016		2015		2016		2015
Net revenues:
U.S.	$	3,268	$	3,713	$	8,898	$	11,032
Foreign		7,555		5,490		21,057		19,918
	$	10,823	$	9,203	$	29,955	$	30,950

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

	Sept. 30, 2016		Dec. 31, 2015
Property and equipment:
U.S.	$	725	$	797
Foreign		270		315
	$	995	$	1,112