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Earnings per share (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings Per Share [Line Items] |  |  |
Net income attributable to Consolidated Water Co. Ltd. stockholders | $ 6,144,062 | $ 3,960,501 | $ 7,518,701
Less: preferred stock dividends | (11,418) | (11,563) | (12,028)
Net income available to common shares in the determination of basic earnings per common share | $ 6,132,644 | $ 3,948,938 | $ 7,506,673
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) | 14,896,944 | 14,809,909 | 14,741,748
Weighted average number of preferred shares outstanding during the period (in shares) | 35,765 | 37,706 | 38,612
Potential dilutive effect of unexercised options (in shares) | 73,972 | 96,413 | 47,395
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) | 15,006,681 | 14,944,028 | 14,827,755

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