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Earnings per share (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income attributable to Consolidated Water Co. Ltd. common stockholders $ 9,315,514 $ 6,113,218 $ 6,292,025
Less: preferred stock dividends (9,080) (7,040) (5,350)
Net income available to common shares in the determination of basic earnings per common share $ 9,306,434 $ 6,106,178 $ 6,286,675
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders 14,578,518 14,560,259 14,547,065
Weighted average number of preferred shares outstanding during the period 27,057 19,892 18,723
Potential dilutive effect of unexercised options 573 15,862 32,106
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders 14,606,148 14,596,013 14,597,894