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Earnings per share (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Earnings per share |  |  |  |
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ 2,709,719 | $ (1,513,270) | $ 5,033,848 | $ (211,704)
Less: preferred stock dividends | (3,250) | (3,175) | (5,684) | (5,734)
Net income from continuing operations available to common shares in the determination of basic earnings per common share | 2,706,469 | (1,516,445) | 5,028,164 | (217,438)
Loss from discontinued operations | (419,833) | (151,379) | (1,027,147) | (464,173)
Net income available to common shares in the determination of basic earnings per common share | $ 2,286,636 | $ (1,667,824) | $ 4,001,017 | $ (681,611)
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) | 15,285,523 | 15,201,682 | 15,285,523 | 15,201,571
Weighted average number of preferred shares outstanding during the period (in shares) | 29,049 |  | 28,843 |
Potential dilutive effect of unexercised options and unvested stock grants | 121,849 |  | 121,590 |
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 15,436,421 | 15,201,682 | 15,435,956 | 15,201,571

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