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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following summarizes information related to the computation of basic and diluted EPS for the respective years ended December 31:
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 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 |
Plus: |  |  |  |  |  |  |  |  |  |  |  |
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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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