Note J - Business Segment and Geographic Disclosures (Tables)

9 Months Ended

Sep. 30, 2012

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

Three months ended September 30, 2012	Air Pollution Control Segment		FUEL CHEM Segment		Other			Total
Revenues from external customers	$	15,432	$	9,475	$	-		$	24,907
Cost of sales		10,282		4,389		-			14,671
Gross margin		5,150		5,086		-			10,236
Selling, general and administrative		-		-		(8,064	)		(8,064	)
Research and development		-		-		(569	)		(569	)
Operating income (loss)		5,246		4,990		(8,633	)		1,603

Three months ended September 30, 2011	Air Pollution Control Segment		FUEL CHEM Segment		Other			Total
Revenues from external customers	$	12,223	$	11,800	$	-		$	24,023
Cost of sales		7,539		5,511		-			13,050
Gross margin		4,684		6,289		-			10,973
Selling, general and administrative		-		-		(7,701	)		(7,701	)
Research and development		-		-		(358	)		(358	)
Operating income (loss)	$	4,684	$	6,289	$	(8,059	)	$	2,914

Nine months ended September 30, 2012	Air Pollution Control Segment		FUEL CHEM Segment		Other			Total
Revenues from external customers	$	43,964	$	27,066	$	-		$	71,030
Cost of sales		26,984		12,787		-			39,771
Gross margin		16,980		14,279		-			31,259
Selling, general and administrative		-		-		(24,932	)		(24,932	)
Research and development		-		-		(2,044	)		(2,044	)
Operating income (loss)	$	16,980	$	14,279	$	(26,976	)	$	4,283

Nine months ended September 30, 2011	Air Pollution Control Segment		FUEL CHEM Segment		Other			Total
Revenues from external customers	$	32,959	$	32,707	$	-		$	65,666
Cost of sales		18,338		16,731		-			35,069
Gross margin		14,621		15,976		-			30,597
Selling, general and administrative		-		-		(23,618	)		(23,618	)
Gain from revaluation of contingentperformance obligation		-		-		758			758
Research and development		-		-		(1,075	)		(1,075	)
Operating income (loss)	$	14,621	$	15,976	$	(23,935	)	$	6,662

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

	Three months ended September 30,				Nine months ended September 30
	2012		2011		2012		2011
Revenues:
United States	$	16,609	$	19,121	$	57,519	$	54,268
Foreign		8,298		4,902		13,511		11,398
	$	24,907	$	24,023	$	71,030	$	65,666

	September 30, 2012		December 31, 2011
Assets:
United States	$	85,338	$	99,601
Foreign		19,184		13,389
	$	104,522	$	112,990