Note J - Business Segment and Geographic Disclosures (Detail) - Reporting Segment Net Sales and Gross Margin (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2009	Jun. 30, 2012	Jun. 30, 2011
Revenues from external customers	$ 20,911	$ 19,021				$ 46,123	$ 41,643
Cost of sales	11,880	10,553				25,100	22,019
Gross margin	9,031	8,468				21,023	19,624
Selling, general and administrative	(7,874)	(7,966)				(16,868)	(15,917)
Research and development	(969)	(315)				(1,475)	(717)
Gain from revaluation of ACT liability		758		(768)	(781)		758
Operating income	188	945	945			2,680	3,748
Air Pollution Control Segment [Member]
Revenues from external customers	12,818	9,644				28,532	20,736
Cost of sales	7,951	5,246				16,702	10,799
Gross margin	4,867	4,398				11,830	9,937
Operating income	4,867		4,398			11,830	9,937
Fuel Chem Segment [Member]
Revenues from external customers	8,093	9,377				17,591	20,907
Cost of sales	3,929	5,307				8,398	11,220
Gross margin	4,164	4,070				9,193	9,687
Operating income	4,164		4,070			9,193	9,687
Other Segments [Member]
Selling, general and administrative	(7,874)	(7,966)				(16,868)	(15,917)
Research and development	(969)	(315)				(1,475)	(717)
Gain from revaluation of ACT liability		758					758
Operating income	$ (8,843)		$ (7,523)			$ (18,343)	$ (15,876)

Gain on revaluation of ACT liability

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- Definition

The aggregate cost of goods produced and sold and services rendered during the reporting period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph g

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Paragraph 11, 12

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-Topic 985

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-Number 2

-Paragraph 12, 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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-Subparagraph (SX 210.5-03.1)

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Paragraph 5A

-Chapter 4

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