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Earnings per share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income attributable to Consolidated Water Co. Ltd. stockholders	$ 2,188,193	$ 624,548	$ 4,280,718	$ 3,255,776
Less: preferred stock dividends	(3,488)	(3,382)	(6,296)	(6,023)
Net income available to common shares in the determination of basic earnings per common share	$ 2,184,705	$ 621,166	$ 4,274,422	$ 3,249,753
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders	14,959,309	14,889,816	14,959,284	14,880,889
Plus:
Weighted average number of preferred shares outstanding during the period	34,442	36,684	33,767	35,958
Potential dilutive effect of unexercised options and unvested stock grants	123,975	129,054	123,661	128,357
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders	15,117,726	15,055,554	15,116,712	15,045,204

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