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Earnings per Share | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share Basic earnings per share excludes the dilutive effects of stock options, restricted stock units (RSUs), 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, 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 are excluded from diluted earnings per share because they are anti-dilutive. For the three months ended March 31, 2019 and 2018, basic earnings per share is equal to diluted earnings per share because all outstanding stock awards 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 months ended March 31, 2019 and 2018.
| Three Months Ended March 31,
| 2019 | 2018
Basic weighted-average shares | 24,177,000 |  | 24,146,000 |
Conversion of unsecured loan notes | — |  | — |
Unexercised options and unvested RSUs | — |  | — |
Diluted weighted-average shares | 24,177,000 |  | 24,146,000 |
Fuel Tech had 1,280,000 and 1,318,000 weighted average equity awards outstanding at March 31, 2019 and 2018, 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 The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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