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Basic and Diluted Earnings per Share | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Earnings per Share |
NOTE 6. | BASIC AND DILUTED EARNINGS PER SHARE
Diluted earnings attributable to shareholders per share is computed using the weighted average number of common shares and dilutive potential common shares outstanding. Dilutive potential shares represent outstanding stock options, including purchase options under the Company's employee stock purchase plan and unvested RSUs. Basic earnings attributable to shareholders per share is calculated using the weighted average number of common shares outstanding without taking into consideration dilutive potential common shares outstanding. The following table reconciles the numerator and the denominator of the basic and diluted per share computations for earnings attributable to shareholders.
|  |  | Net earnings attributable to shareholders |  |  | Weighted average shares |  |  | Earnings per share |
| 2021 |  |  |  |  |  |  |  |  |  |  |  |
| Basic earnings attributable to shareholders |  | $ | 1,415,492 |  |  |  | 169,145 |  |  | $ | 8.37 |
| Effect of dilutive potential common shares |  |  | — |  |  |  | 2,105 |  |  |  | — |
| Diluted earnings attributable to shareholders |  | $ | 1,415,492 |  |  |  | 171,250 |  |  | $ | 8.27 |
| 2020 |  |  |  |  |  |  |  |  |  |  |  |
| Basic earnings attributable to shareholders |  | $ | 696,140 |  |  |  | 168,333 |  |  | $ | 4.14 |
| Effect of dilutive potential common shares |  |  | — |  |  |  | 2,563 |  |  |  | — |
| Diluted earnings attributable to shareholders |  | $ | 696,140 |  |  |  | 170,896 |  |  | $ | 4.07 |
| 2019 |  |  |  |  |  |  |  |  |  |  |  |
| Basic earnings attributable to shareholders |  | $ | 590,395 |  |  |  | 170,899 |  |  | $ | 3.45 |
| Effect of dilutive potential common shares |  |  | — |  |  |  | 3,310 |  |  |  | — |
| Diluted earnings attributable to shareholders |  | $ | 590,395 |  |  |  | 174,209 |  |  | $ | 3.39 |
Substantially all outstanding potential common shares in 2021, 2020 and 2019 were dilutive.

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