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Note 8 - Net Income Loss Per Share | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Earnings Per Share [Text Block] | 8. Net Income/Loss Per Share The following summarizes the computation of basic and diluted net income(loss) per share for the years ended December 31, 2021, 2020 and 2019 (in thousands, except share and per share data):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net income (loss) |  | $ | (17,414 | ) |  | $ | (11,221 | ) |  | $ | 668,629 |
Weighted-average number of common shares—basic |  |  | 30,043,380 |  |  |  | 30,823,458 |  |  |  | 38,945,468 |
Net income (loss) per share—basic |  | $ | (0.58 | ) |  | $ | (0.36 | ) |  | $ | 17.17 |
Weighted-average number of common shares—diluted |  |  | 30,043,380 |  |  |  | 30,823,458 |  |  |  | 46,319,457 |
Net income (loss) per share—diluted |  | $ | (0.58 | ) |  | $ | (0.36 | ) |  | $ | 14.44 |
The following potentially dilutive securities outstanding, prior to the use of the treasury stock method or if-converted method, have been excluded from the computation of diluted weighted-average common shares outstanding, because including them would have had an anti-dilutive effect due to the losses reported.
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Stock options |  |  | 4,656,677 |  |  |  | 5,327,425 |  |  |  | 6,965,730 |
Warrants to purchase common stock |  |  | - |  |  |  | - |  |  |  | - |
Total |  |  | 4,656,677 |  |  |  | 5,327,425 |  |  |  | 6,965,730 |

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