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Earnings per share (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Earnings per share |  |  |  |
Net income (loss) from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ (1,127,842) | $ 2,476,262 | $ 1,760,765 | $ 5,041,523
Less: preferred stock dividends | (3,420) | (3,410) | (6,289) | (6,199)
Net income (loss) from continuing operations available to common shares in the determination of basic earnings per common share | (1,131,262) | 2,472,852 | 1,754,476 | 5,035,324
Total income from discontinued operations | 0 | 0 | 0 | 3,621,170
Net income (loss) available to common shares in the determination of basic earnings per common share | $ (1,131,262) | $ 2,472,852 | $ 1,754,476 | $ 8,656,494
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) | 15,114,506 | 15,020,344 | 15,114,506 | 15,020,344
Weighted average number of preferred shares outstanding during the period (in shares) |  | 34,183 | 34,438 | 33,834
Potential dilutive effect of unexercised options and unvested stock grants |  | 131,285 | 120,231 | 131,285
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 15,114,506 | 15,185,812 | 15,269,175 | 15,185,463

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