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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% |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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