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Note 7 - Earnings Per Share | 6 Months Ended
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Jun. 30, 2023
Notes to Financial Statements |
Earnings Per Share [Text Block] | 7. Earnings per Share Basic earnings per share excludes the dilutive effects of stock options, restricted stock units (RSUs), warrants, and the nil coupon non-redeemable convertible unsecured loan notes. Diluted earnings per share includes the dilutive effect of the nil coupon non-redeemable convertible unsecured loan notes, RSUs, warrants, and unexercised in-the-money stock options, except in periods of net loss where the effect of these instruments is anti-dilutive. Out-of-money stock options and warrants are excluded from diluted earnings per share because they are unlikely to be exercised and would be anti-dilutive if they were exercised. For the three and six months ended June 30, 2023 and 2022, basic earnings per share is equal to diluted earnings per share because all outstanding stock awards, warrants, and convertible loan notes are considered anti-dilutive during periods of net loss. The following table sets forth the weighted-average shares used in calculating the earnings per share for the three and six months ended June 30, 2023 and 2022.
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Basic weighted-average shares |  |  | 30,324,000 |  |  |  | 30,296,000 |  |  |  | 30,310,000 |  |  |  | 30,282,000 |
Conversion of unsecured loan notes |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Unexercised options and unvested RSUs |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Diluted weighted-average shares |  |  | 30,324,000 |  |  |  | 30,296,000 |  |  |  | 30,310,000 |  |  |  | 30,282,000 |
For the three and six months ended June 30, 2023, Fuel Tech had weighted-average outstanding equity awards of 313,700 and 364,800, respectively, and warrants of 2,850,000 in both periods, which were antidilutive for the purpose of the calculation of diluted earnings per share. For the three and six months ended June 30, 2023, Fuel Tech had 267,000 and 263,000, respectively, incremental equity awards that were excluded from the computation of diluted earnings per share as the inclusion of such would have been anti-dilutive due to a net loss in the period. For the three and six months ended June 30, 2022, Fuel Tech had weighted-average outstanding equity awards of 583,000 and 466,000, respectively, and warrants of 2,850,000 in both periods, which were antidilutive for the purpose of the calculation of diluted earnings per share. For the three and six months ended June 30, 2022, Fuel Tech had 23,000 and 36,000, respectively, incremental equity awards that were excluded from the computation of diluted earnings per share as the inclusion of such would have been anti-dilutive due to a net loss in the period. These equity awards could potentially dilute basic earnings per share in future years.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-3 + Details
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