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Earnings per share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net income (loss) attributable to Consolidated Water Co. Ltd. stockholders $ 1,161,139 $ (1,865,332) $ 4,416,915 $ 2,393,642
Less: preferred stock dividends (2,548) (2,680) (8,571) (8,921)
Net income (loss) available to common shares in the determination of basic earnings per common share $ 1,158,591 $ (1,868,012) $ 4,408,344 $ 2,384,721
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders 14,898,246 14,815,248 14,886,738 14,803,216
Plus:        
Weighted average number of preferred shares outstanding during the period 45,087 37,719 39,035 38,516
Potential dilutive effect of unexercised options and unvested stock grants 128,809 0 128,570 98,903
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders 15,072,142 14,852,967 15,054,343 14,940,635