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Earnings per share (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Earnings per share |  |
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ 1,301,566 | $ 3,204,972
Less: preferred stock dividends | (2,559) | (2,869)
Net income from continuing operations available to common shares in the determination of basic earnings per common share | 1,299,007 | 3,202,103
Total income (loss) from discontinued operations | (312,794) | (316,365)
Net income available to common shares in the determination of basic earnings per common share | $ 986,213 | $ 2,885,738
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) | 15,201,458 | 15,114,506
Weighted average number of preferred shares outstanding during the period (in shares) | 30,469 | 33,751
Potential dilutive effect of unexercised options and unvested stock grants | 124,915 | 120,627
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 15,356,842 | 15,268,884

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