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Earnings per share (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income attributable to Consolidated Water Co. Ltd. common stockholders	$ 3,742,003	$ 2,342,666
Less: preferred stock dividends	(2,232)	(1,657)
Net income available to common shares in the determination of basic earnings per common share	$ 3,739,771	$ 2,341,009
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)	14,598,096	14,569,883
Weighted average number of preferred shares outstanding during the period	29,879	22,292
Potential dilutive effect of unexercised options	7,359	4,305
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares)	14,635,334	14,596,480

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