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Earnings per share (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Earnings per share    
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders $ 8,554,923 $ 10,177,662
Less: preferred stock dividends (11,937) (12,356)
Net income from continuing operations available to common shares in the determination of basic earnings per common share 8,542,986 10,165,306
Total income from discontinued operations 3,621,170 1,115,825
Net income available to common shares in the determination of basic earnings per common share $ 12,164,156 $ 11,281,131
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) 15,025,639 14,962,760
Weighted average number of preferred shares outstanding during the period (in shares) 33,983 35,125
Potential dilutive effect of unexercised options and unvested stock grants 77,454 76,262
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders 15,137,076 15,074,147