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Earnings per share (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share [Line Items] |  |
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ 2,565,261 | $ 1,765,468
Less: preferred stock dividends | (2,789) | (2,478)
Net income from continuing operations available to common shares in the determination of basic earnings per common share | 2,562,472 | 1,762,990
Total income from discontinued operations | 3,621,170 | 327,057
Net income available to common shares in the determination of basic earnings per common share | $ 6,183,642 | $ 2,090,047
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 | 14,959,259
Weighted average number of preferred shares outstanding during the period (in shares) | 33,480 | 33,084
Potential dilutive effect of unexercised options and unvested stock grants | 75,577 | 122,134
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) | 15,129,401 | 15,114,477

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