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Earnings per share (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Earnings per share |  |  |  |
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ (1,513,270) | $ 2,627,270 | $ (211,704) | $ 5,832,242
Less: preferred stock dividends | (3,175) | (3,420) | (5,734) | (6,289)
Net income from continuing operations available to common shares in the determination of basic earnings per common share | (1,516,445) | 2,623,850 | (217,438) | 5,825,953
Total income (loss) from discontinued operations | (151,379) | (3,755,112) | (464,173) | (4,071,477)
Net income available to common shares in the determination of basic earnings per common share | $ (1,667,824) | $ (1,131,262) | $ (681,611) | $ 1,754,476
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) | 15,201,682 | 15,114,506 | 15,201,571 | 15,114,506
Weighted average number of preferred shares outstanding during the period (in shares) |  | 35,126 |  | 34,438
Potential dilutive effect of unexercised options and unvested stock grants |  | 119,702 |  | 120,231
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 15,201,682 | 15,269,334 | 15,201,571 | 15,269,175

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