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Note 8 - Per Share Data | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Earnings Per Share [Text Block] | 8. Per Share Data The Company computes, presents and discloses earnings per share in accordance with the authoritative guidance which specifies the computation, presentation and disclosure requirements for earnings per share of entities with publicly held common stock or potential common stock. The objective of basic EPS is to measure the performance of an entity over the reporting period by dividing income (loss) by the weighted average shares outstanding. The objective of diluted EPS is consistent with that of basic EPS, except that it also gives effect to all potentially dilutive common shares outstanding during the period. The following is a reconciliation of the basic and diluted earnings (loss) per share computation:
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net income (loss) for basic earnings per share |  | $ | 69,450,766 |  |  | $ | 56,342,010 |  |  | $ | (7,241,147 | )
Less: Change in fair value of warrants |  |  | 117,770 |  |  |  | — |  |  |  | 5,091,256 |
Net income (loss), adjusted for change in fair value of warrants for diluted earnings per share |  | $ | 69,332,996 |  |  | $ | 56,342,010 |  |  | $ | (12,332,403 | )
Weighted-average shares |  |  | 75,322,194 |  |  |  | 79,259,000 |  |  |  | 81,031,254 |
Effect of potential common shares |  |  | 1,080,522 |  |  |  | 178,306 |  |  |  | 1,143,769 |
Weighted-average shares: diluted |  |  | 76,402,716 |  |  |  | 79,437,306 |  |  |  | 82,175,023 |
Earnings (loss) per share: basic |  | $ | 0.92 |  |  | $ | 0.71 |  |  | $ | (0.09 | )
Earnings (loss) per share: diluted |  | $ | 0.91 |  |  | $ | 0.71 |  |  | $ | (0.15 | )
For the year ended December 31, 2021, the diluted earnings per share calculation reflects the effect of the assumed exercise of outstanding warrants and any corresponding elimination of the impact included in operating results from the change in fair value of the warrants. Weighted-average diluted shares include the dilutive effect of in-the-money options and warrants, unvested restricted stock and unreleased RSUs. The dilutive effect of warrants and options is calculated based on the average share price for each fiscal period using the treasury stock method. Under the treasury stock method, the amount the employee must pay for exercising stock options, the average amount of compensation cost for future service that the Company has not yet recognized, and the amount of tax benefits that would be recorded in additional paid-in capital when the award becomes deductible, are collectively assumed to be used to repurchase shares. Cash-settled RSUs were presumed to be cash-settled and therefore excluded from the diluted earnings per share calculations for the year ended December 31, 2021 because the net effect of their inclusion, including the elimination of the impact in the operating results of the change in fair value of the warrants, would have been anti-dilutive. For the year ended December 31, 2021, the weighted average number of shares under the cash-settled RSUs excluded from the calculation of diluted earnings per share was 29,873. For the year ended December 31, 2020, diluted shares outstanding include the dilutive effect of in-the-money options, unvested restricted stock and unreleased RSUs. The dilutive effect of options is calculated based on the average share price for each fiscal period using the treasury stock method. Under the treasury stock method, the amount the employee must pay for exercising stock options, the average amount of compensation cost for future service that the Company has not yet recognized, and the amount of tax benefits that would be recorded in additional paid-in capital when the award becomes deductible, are collectively assumed to be used to repurchase shares. Warrants were presumed to be cash-settled and therefore excluded from the diluted earnings per share calculations for the year ended December 31, 2020 because the net effect of their inclusion, including the elimination of the impact in the operating results of the change in fair value of the warrants, would have been anti-dilutive. For the year ended December 31, 2020, the weighted average number of shares under the warrant excluded from the calculation of diluted earnings per share was 1,124,585. The Company incurred losses for the year ended December 31, 2019 and as a result, for such year the equity instruments listed below were excluded from the calculation of diluted earnings (loss) per share as the effect of the exercise, conversion or vesting of such instruments would have been anti-dilutive. The weighted average number of equity instruments excluded consisted of:
|  | Year Ended December 31, |
|  | 2019 |
Stock Options |  |  | 340,284 |
Stock-Settled Stock Appreciation Rights |  |  | 1,666 |
Restricted Stock Units |  |  | 525,741 |

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