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- Definition

The percentage of shares issued and reserved for share-based payment award to total shares outstanding.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.

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Gross carrying amount before accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Describes the nature of the product warranty, including the approximate term of the product warranty, how the product warranty arose, and the events or circumstances that would require the warrantor to perform under the product warranty.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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Note 1 - Organization and Significant Accounting Policies (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries (in Dollars)	$ 27,219	$ 17,591	$ 12,793
Percentage Of Net Income, Foreign	28.00%	19.00%	16.00%
Restricted Cash and Cash Equivalents (in Dollars)	1,131
Unbilled Contracts Receivable (in Dollars)	15,661	11,334
Number of Reportable Segments	2
Goodwill (in Dollars)	21,051	21,051
Finite-Lived Patents, Gross (in Dollars)	1,026	786
Amortization of Intangible Assets (in Dollars)	898	912	886
Depreciation (in Dollars)	2,191	2,808	3,195
Percentage of Shares Issued and Reserved for Share-based Payment Award	12.50%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	430,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)	1,914,000	1,902,000	2,856,125	3,051,125
Available-for-sale Securities, Fair Value Disclosure (in Dollars)	44	57
Treasury Stock, Shares (in Shares)	9,126	0
Treasury Stock, Value (in Dollars)	39
Customer One [Member] \| Fuel Chem Segment [Member] \| Sales Revenue, Services, Net [Member]
Concentration Risk, Percentage			16.00%
Customer Two [Member] \| Fuel Chem Segment [Member] \| Sales Revenue, Services, Net [Member]
Concentration Risk, Percentage			13.00%
Fuel Chem Segment [Member] \| Sales Revenue, Services, Net [Member]
Concentration Risk, Customer			Two
Concentration Risk, Percentage	16.00%	16.00%
Fuel Chem Segment [Member]
Goodwill (in Dollars)	1,723	1,723
APC Technology Segment [Member] \| Sales Revenue, Services, Net [Member]
Concentration Risk, Customer		The other	one
Concentration Risk, Percentage		13.00%	14.00%
APC Technology Segment [Member] \| Accounts Receivable [Member]
Concentration Risk, Customer			a
Concentration Risk, Percentage			13.00%
APC Technology Segment [Member]
Goodwill (in Dollars)	19,328	19,328
Antidilutive [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)	1,507,000	1,368,000	2,379,000
Minimum [Member]
Standard Product Warranty Description	one
Maximum [Member]
Standard Product Warranty Description	two
Capitalized Third-party Costs [Member]
Finite-Lived Patents, Gross (in Dollars)	$ 313	$ 307
Fuel Chem Segment [Member] \| Sales Revenue, Services, Net [Member]
Concentration Risk, Customer		One
Sales Revenue, Services, Net [Member]
Concentration Risk, Customer	one	two	three
Concentration Risk, Percentage	10.00%	10.00%	10.00%
Accounts Receivable [Member]
Concentration Risk, Customer	no	no
Concentration Risk, Percentage	10.00%	10.00%