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Earnings per share (Tables) | 9 Months Ended
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Sep. 30, 2018
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:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Net income attributable to Consolidated Water Co. Ltd. stockholders |  | $ | 4,552,389 |  |  | $ | 1,161,139 |  |  | $ | 8,833,107 |  |  | $ | 4,416,915 |
Less: preferred stock dividends |  |  | (3,102 | ) |  |  | (2,548 | ) |  |  | (9,398 | ) |  |  | (8,571 | )
Net income available to common shares in the determination of basic earnings per common share |  | $ | 4,549,287 |  |  | $ | 1,158,591 |  |  | $ | 8,823,709 |  |  | $ | 4,408,344 |
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders |  |  | 14,963,195 |  |  |  | 14,898,246 |  |  |  | 14,960,602 |  |  |  | 14,886,738 |
Plus: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of preferred shares outstanding during the period |  |  | 37,621 |  |  |  | 45,087 |  |  |  | 35,066 |  |  |  | 39,035 |
Potential dilutive effect of unexercised options and unvested stock grants |  |  | 123,904 |  |  |  | 128,809 |  |  |  | 123,747 |  |  |  | 128,570 |
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders |  |  | 15,124,720 |  |  |  | 15,072,142 |  |  |  | 15,119,415 |  |  |  | 15,054,343 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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