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Earnings per Share Data (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table sets forth the weighted-average shares used in calculating the earnings per share for the three-month periods ended September 30, 2013 and 2012.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Basic weighted-average shares |  | 22,376,000 |  |  | 22,105,000 |  |  | 22,229,000 |  |  | 22,932,000 |
Conversion of unsecured loan notes |  | 7,000 |  |  | 7,000 |  |  | 7,000 |  |  | 7,000 |
Unvested options and RSUs |  | 151,000 |  |  | 910,000 |  |  | 222,000 |  |  | 810,000 |
Diluted weighted-average shares |  | 22,534,000 |  |  | 23,022,000 |  |  | 22,458,000 |  |  | 23,749,000 |
Fuel Tech had 2,031,000 and 1,547,000 weighted average stock awards outstanding at September 30, 2013 and 2012, respectively, that were not dilutive for the purposes of inclusion in the calculation of diluted earnings per share but could potentially become dilutive in future periods.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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