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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2024
Earnings Per Share [Abstract] |
Basic and diluted earnings per share calculation | The Company calculates basic and diluted earnings per share as follows:
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | Basic EPS |  |  | Diluted EPS |  |  | Basic EPS |  |  | Diluted EPS |  |  | Basic EPS |  |  | Diluted EPS |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | 34,253,365 |  |  |  | 34,253,365 |  |  |  | 51,936,829 |  |  |  | 51,936,829 |  |  |  | 69,862,177 |  |  |  | 69,862,177 |
Less: Undistributed earnings allocated to non-vested shares |  |  | 216,168 |  |  |  | 216,168 |  |  |  | 813,111 |  |  |  | 811,596 |  |  |  | 2,701,759 |  |  |  | 2,694,694 |
Net income attributable to common shareholders |  |  | 34,037,197 |  |  |  | 34,037,197 |  |  |  | 51,123,689 |  |  |  | 51,125,233 |  |  |  | 67,160,418 |  |  |  | 67,167,483 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares, basic |  |  | 37,961,560 |  |  |  | 37,961,560 |  |  |  | 37,166,449 |  |  |  | 37,166,449 |  |  |  | 35,237,059 |  |  |  | 35,237,059 |
Effect of dilutive shares |  |  | — |  |  |  | 113 |  |  |  | — |  |  |  | 70,502 |  |  |  | — |  |  |  | 96,101 |
Weighted average number of shares, basic |  |  | 37,961,560 |  |  |  | 37,961,673 |  |  |  | 37,166,449 |  |  |  | 37,236,951 |  |  |  | 35,237,059 |  |  |  | 35,333,160 |
Earnings per share |  |  | 0.90 |  |  |  | 0.90 |  |  |  | 1.38 |  |  |  | 1.37 |  |  |  | 1.91 |  |  |  | 1.90 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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