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Earnings per share (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ 2,476,262 | $ 1,888,818 | $ 5,041,523 | $ 3,654,286
Less: preferred stock dividends | (3,410) | (3,488) | (6,199) | (6,296)
Net income from continuing operations available to common shares in the determination of basic earnings per common share | 2,472,852 | 1,885,330 | 5,035,324 | 3,647,990
Total income from discontinued operations | 0 | 299,375 | 3,621,170 | 626,432
Net income available to common shares in the determination of basic earnings per common share | $ 2,472,852 | $ 2,184,705 | $ 8,656,494 | $ 4,274,422
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) | 15,020,344 | 14,959,309 | 15,020,344 | 14,959,284
Weighted average number of preferred shares outstanding during the period (in shares) | 34,183 | 34,442 | 33,834 | 33,767
Potential dilutive effect of unexercised options and unvested stock grants | 76,251 | 123,975 | 75,893 | 123,661
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) | 15,130,778 | 15,117,726 | 15,130,071 | 15,116,712

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