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Earnings per share (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Earnings per share |  |  |  |
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ 7,531,472 | $ 2,709,719 | $ 11,604,261 | $ 5,033,848
Less: preferred stock dividends | (4,087) | (3,250) | (7,010) | (5,684)
Net income from continuing operations available to common shares in the determination of basic earnings per common share | 7,527,385 | 2,706,469 | 11,597,251 | 5,028,164
Total loss from discontinued operations | (207,701) | (419,833) | (466,864) | (1,027,147)
Net income available to common shares in the determination of basic earnings per common share | $ 7,319,684 | $ 2,286,636 | $ 11,130,387 | $ 4,001,017
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) | 15,736,041 | 15,285,523 | 15,729,852 | 15,285,523
Weighted average number of preferred shares outstanding during the period (in shares) | 34,695 | 29,049 | 34,540 | 28,843
Potential dilutive effect of unexercised options and unvested stock grants | 136,704 | 121,849 | 135,531 | 121,590
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 15,907,440 | 15,436,421 | 15,899,923 | 15,435,956

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