Segment Reporting and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Revenues
Heavy Duty Diesel Systems	$	7,018	$	7,109	$	14,176	$	14,393
Catalyst		6,289		6,296		12,100		12,752
Corporate		-		-		-		-
Eliminations (1)		(716)		(850)		(1,223)		(1,283)
Total	$	12,591	$	12,555	$	25,053	$	25,862
(Loss) income from operations
Heavy Duty Diesel Systems	$	660	$	(81)	$	938	$	(418)
Catalyst		361		132		583		253
Corporate		(1,591)		(1,259)		(3,524)		(3,076)
Eliminations (1)		10		39		(10)		78
Total	$	(560)	$	(1,169)	$	(2,013)	$	(3,163)
(1)  Elimination of Catalyst revenue and profit in ending inventory related to sales to Heavy Duty Diesel Systems.

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
United States	$	6,584	$	6,458	$	12,881	$	13,426
Canada		4,705		4,847		9,732		9,683
Europe		1,302		1,250		2,440		2,753
Total international		6,007		6,097		12,172		12,436
Total revenues	$	12,591	$	12,555	$	25,053	$	25,862