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Earnings per share (Tables) | 9 Months Ended
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Sep. 30, 2013
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 three and nine months ended September 30, 2013 and 2012.
| Three Months Ended September 30, |  | Nine Months Ended September 30, |
| 2013 |  | 2012 |  | 2013 |  | 2012 |
Net income attributable to Consolidated Water Co. Ltd. Common stockholders | $ | 908,690 |  | $ | 1,304,843 |  | $ | 7,504,542 |  | $ | 5,605,001 |
Less: preferred stock dividends |  | (2,885) |  |  | (2,270) |  |  | (8,655) |  |  | (6,810) |
Net income available to common shares in the determination of basic earnings per common share | $ | 905,805 |  | $ | 1,302,573 |  | $ | 7,495,887 |  | $ | 5,598,191 |
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders |  | 14,644,740 |  |  | 14,580,946 |  |  | 14,626,755 |  |  | 14,576,790 |
Plus: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of preferred shares outstanding during the period |  | 39,680 |  |  | 31,504 |  |  | 33,888 |  |  | 25,980 |
Potential dilutive effect of unexercised options |  | 50,496 |  |  | 4,745 |  |  | 21,543 |  |  | 1,628 |
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders |  | 14,734,916 |  |  | 14,617,195 |  |  | 14,682,186 |  |  | 14,604,398 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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