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Earnings per share (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings per share |  |  |  |
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ 1,727,052 | $ 4,309,027 | $ 6,768,575 | $ 7,963,313
Less: preferred stock dividends | (2,869) | (3,102) | (9,068) | (9,398)
Net income from continuing operations available to common shares in the determination of basic earnings per common share | 1,724,183 | 4,305,925 | 6,759,507 | 7,953,915
Total income from discontinued operations | 0 | 243,362 | 3,621,170 | 869,794
Net income available to common shares in the determination of basic earnings per common share | $ 1,724,183 | $ 4,549,287 | $ 10,380,677 | $ 8,823,709
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) | 15,026,710 | 14,963,195 | 15,022,489 | 14,960,602
Weighted average number of preferred shares outstanding during the period (in shares) | 34,507 | 37,621 | 34,061 | 35,066
Potential dilutive effect of unexercised options and unvested stock grants | 76,877 | 123,904 | 76,293 | 123,747
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) | 15,138,094 | 15,124,720 | 15,132,843 | 15,119,415

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