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Earnings per share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings per share        
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders $ 1,363,960 $ 1,812,156 $ 1,152,256 $ 7,644,398
Less: preferred stock dividends (2,628) (2,810) (8,362) (9,099)
Net income from continuing operations available to common shares in the determination of basic earnings per common share 1,361,332 1,809,346 1,143,894 7,635,299
Total loss from discontinued operations (1,078,367) (377,321) (1,542,540) (4,448,798)
Net income (loss) available to common shares in the determination of basic earnings per common share $ 282,965 $ 1,432,025 $ (398,646) $ 3,186,501
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) 15,209,432 15,120,983 15,204,220 15,116,681
Weighted average number of preferred shares outstanding during the period (in shares) 31,861 34,191 30,701 34,355
Potential dilutive effect of unexercised options and unvested stock grants 110,589 118,355 110,199 119,458
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders 15,351,882 15,273,529 15,345,120 15,270,494