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Note 10 - Net Income (Loss) Per Common Share | 3 Months Ended
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Mar. 31, 2020
Notes to Financial Statements |
Earnings Per Share [Text Block] | 10 . Net Income (Loss) per Common Share The Company considers its unexercised warrants and unvested restricted shares, which contain non-forfeitable rights to dividends, participating securities, and includes such participating securities in its computation of earnings per share pursuant to the two -class method. Basic earnings per share for the two classes of stock (common stock and warrants) is calculated by dividing net income by the weighted average number of shares of common stock and warrants outstanding during the reporting period. Diluted earnings per share is calculated using the weighted average number of shares of common stock plus the potentially dilutive effect of common equivalent shares outstanding determined under both the two class method and the treasury stock method, whichever is more dilutive. In periods when we have a net loss, common stock equivalents are excluded from our calculation of earnings per share as their inclusion would have an antidilutive effect. For the three month period ended March 31, 2020, we excluded 1.9 million common stock options, 2.7 million warrants, and a nominal amount of unvested stock awards from our calculation of diluted weighted average shares because they were antidilutive. For the three month period ended March 31, 2019, we excluded 2.7 million common stock options, 3.0 million warrants, and a nominal amount of unvested stock awards from our calculation of diluted weighted average shares because they were antidilutive. The following table presents computations of basic and diluted earnings per share under the two class method:
|  | Three Month s Ended March 31, |
(In thousands, except per share and share data) |  | 2 020 |  |  | 201 9 |
Numerator: |  |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | 18,364 |  |  | $ | (19,161 | )
Diluted |  | $ | (174 | ) |  | $ | (19,161 | )
Denominator: |  |  |  |  |  |  |  |
Basic and diluted weighted average shares outstanding |  |  | 21,010,817 |  |  |  | 18,648,397 |
Basic earnings per share |  | $ | 0.87 |  |  | $ | (1.03 | )
Diluted earnings per share |  | $ | (0.01 | ) |  | $ | (1.03 | )

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