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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
|  | Year Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
Net income attributable to Consolidated Water Co. Ltd. stockholders |  | $ | 6,144,062 |  | $ | 3,960,501 |  | $ | 7,518,701 |
Less: preferred stock dividends |  |  | (11,418) |  |  | (11,563) |  |  | (12,028) |
Net income available to common shares in the determination of basic earnings per common share |  | $ | 6,132,644 |  | $ | 3,948,938 |  | $ | 7,506,673 |
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders |  |  | 14,896,944 |  |  | 14,809,909 |  |  | 14,741,748 |
Plus: |  |  |  |  |  |  |  |  |  |
Weighted average number of preferred shares outstanding during the period |  |  | 35,765 |  |  | 37,706 |  |  | 38,612 |
Potential dilutive effect of unexercised options |  |  | 73,972 |  |  | 96,413 |  |  | 47,395 |
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders |  |  | 15,006,681 |  |  | 14,944,028 |  |  | 14,827,755 |

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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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