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Earnings per share (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Earnings Per Share [Line Items] |  |  |  |
Net income attributable to Consolidated Water Co. Ltd. stockholders | $ 2,204,333 | $ 2,228,100 | $ 4,258,974 | $ 4,149,361
Less: preferred stock dividends | (3,390) | (3,418) | (6,241) | (6,181)
Net income available to common shares in the determination of basic earnings per common share | $ 2,200,943 | $ 2,224,682 | $ 4,252,733 | $ 4,143,180
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders Plus: | 14,792,053 | 14,736,057 | 14,787,716 | 14,727,455
Weighted average number of preferred shares outstanding during the period | 39,255 | 38,459 | 38,919 | 37,654
Potential dilutive effect of unexercised options | 39,811 | 18,782 | 37,156 | 15,160
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 14,871,119 | 14,793,298 | 14,863,791 | 14,780,269

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