Note J - Business Segment and Geographic Disclosures (Tables)

6 Months Ended

Jun. 30, 2012

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

Three months ended June 30, 2012	Air Pollution Control Segment		FUEL CHEM Segment		Other			Total
Revenues from external customers	$	12,818	$	8,093	$	-		$	20,911
Cost of sales		7,951		3,929		-			11,880
Gross margin		4,867		4,164		-			9,031
Selling, general and administrative		-		-		(7,874	)		(7,874	)
Research and development		-		-		(969	)		(969	)
Operating income	$	4,867	$	4,164	$	(8,843	)	$	188

Three months ended June 30, 2011	Air Pollution Control Segment		FUEL CHEM Segment		Other			Total
Revenues from external customers	$	9,644	$	9,377	$	-		$	19,021
Cost of sales		5,246		5,307		-			10,553
Gross margin		4,398		4,070		-			8,468
Selling, general and administrative		-		-		(7,966	)		(7,966	)
Research and development		-		-		(315	)		(315	)
Gain from revaluation of ACT liability		-		-		758			758
Operating income	$	4,398	$	4,070	$	(7,523	)	$	945

Six months ended June 30, 2012	Air Pollution Control Segment		FUEL CHEM Segment		Other			Total
Revenues from external customers	$	28,532	$	17,591	$	-		$	46,123
Cost of sales		16,702		8,398		-			25,100
Gross margin		11,830		9,193		-			21,023
Selling, general and administrative		-		-		(16,868	)		(16,868	)
Research and development		-		-		(1,475	)		(1,475	)
Operating income	$	11,830	$	9,193	$	(18,343	)	$	2,680

Six months ended June 30, 2011	Air Pollution Control Segment		FUEL CHEM Segment		Other			Total
Revenues from external customers	$	20,736	$	20,907	$	-		$	41,643
Cost of sales		10,799		11,220		-			22,019
Gross margin		9,937		9,687		-			19,624
Selling, general and administrative		-		-		(15,917	)		(15,917	)
Research and development		-		-		(717	)		(717	)
Gain from revaluation of ACT liability		-		-		758			758
Operating income	$	9,937	$	9,687	$	(15,876	)	$	3,748

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Three months ended June 30,				Six months ended June 30,
	2012		2011		2012		2011
Revenues:
United States	$	17,966	$	15,529	$	40,910	$	35,147
Foreign		2,945		3,492		5,213		6,496
	$	20,911	$	19,021	$	46,123	$	41,643

	June 30, 2012		December 31, 2011
Assets:
United States	$	87,870	$	99,601
Foreign		12,198		13,389
	$	100,068	$	112,990