Note 11 - Segment Information (Tables)

3 Months Ended

Mar. 31, 2016

Asset [Member]

Notes Tables

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

	Mar. 31, 2016		Dec. 31, 2015
Identifiable assets:
Thermal Products	$	17,246	$	16,983
Mechanical Products		18,960		19,733
Electrical Products		3,700		3,268
	$	39,906	$	39,984

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

	Three Months Ended March 31,
	2016			2015
Net revenues:
Thermal Products	$	5,194		$	5,717
Mechanical Products		1,936			2,435
Electrical Products		1,517			2,036
	$	8,647		$	10,188
Earnings (loss) before income tax expense (benefit):
Thermal Products	$	573		$	1,029
Mechanical Products		(370	)		(285	)
Electrical Products		21			319
Corporate		(100	)		(392	)
	$	124		$	671
Net earnings (loss):
Thermal Products	$	373		$	672
Mechanical Products		(241	)		(186	)
Electrical Products		14			208
Corporate		(65	)		(256	)
	$	81		$	438

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

	Three Months Ended March 31,
	2016		2015
Net revenues:
U.S.	$	2,727	$	3,489
Foreign		5,920		6,699
	$	8,647	$	10,188

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

	Mar. 31, 2016		Dec. 31, 2015
Property and equipment:
U.S.	$	765	$	797
Foreign		250		315
	$	1,015	$	1,112