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Earnings per share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income attributable to Consolidated Water Co. Ltd. common stockholders	$ 1,304,843	$ 1,286,068	$ 5,605,001	$ 5,208,740
Less: preferred stock dividends	(2,270)	(1,716)	(6,810)	(5,391)
Net income available to common shares in the determination of basic earnings per common share	$ 1,302,573	$ 1,284,352	$ 5,598,191	$ 5,203,349
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders	14,580,946	14,560,765	14,576,790	14,558,670
Weighted average number of preferred shares outstanding during the period	31,504	22,703	25,980	19,038
Potential dilutive effect of unexercised options	4,745	7,041	1,628	17,960
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders	14,617,195	14,590,509	14,604,398	14,595,668

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