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Basic and Diluted Earnings per Share | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Earnings per Share | Note 4. 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 restricted stock units. 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:
|  | Three months ended June 30, |
|  | Net earnings attributable to shareholders |  |  | Weighted average shares |  |  | Earnings per share |
2021 |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings attributable to shareholders |  | $ | 316,372 |  |  |  | 169,210 |  |  | $ | 1.87 |
Effect of dilutive potential common shares |  |  | — |  |  |  | 2,467 |  |  |  | — |
Diluted earnings attributable to shareholders |  | $ | 316,372 |  |  |  | 171,677 |  |  | $ | 1.84 |
2020 |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings attributable to shareholders |  | $ | 183,869 |  |  |  | 166,767 |  |  | $ | 1.10 |
Effect of dilutive potential common shares |  |  | — |  |  |  | 2,523 |  |  |  | — |
Diluted earnings attributable to shareholders |  | $ | 183,869 |  |  |  | 169,290 |  |  | $ | 1.09 |
|  | Six months ended June 30, |
|  | Net earnings attributable to shareholders |  |  | Weighted average shares |  |  | Earnings per share |
2021 |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings attributable to shareholders |  | $ | 603,592 |  |  |  | 169,140 |  |  | $ | 3.57 |
Effect of dilutive potential common shares |  |  | — |  |  |  | 2,520 |  |  |  | — |
Diluted earnings attributable to shareholders |  | $ | 603,592 |  |  |  | 171,660 |  |  | $ | 3.52 |
2020 |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings attributable to shareholders |  | $ | 306,213 |  |  |  | 167,751 |  |  | $ | 1.83 |
Effect of dilutive potential common shares |  |  | — |  |  |  | 2,631 |  |  |  | — |
Diluted earnings attributable to shareholders |  | $ | 306,213 |  |  |  | 170,382 |  |  | $ | 1.80 |
Substantially all outstanding potential common shares as of June 30, 2021 and 2020 were dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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