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Earnings per share (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Earnings Per Share [Line Items] |  |  |  |
Net income (loss) attributable to Consolidated Water Co. Ltd. stockholders | $ (1,865,332) | $ 1,775,500 | $ 2,393,642 | $ 5,924,861
Less: preferred stock dividends | (2,680) | (2,937) | (8,921) | (9,118)
Net income (loss) available to common shares in the determination of basic earnings per common share | $ (1,868,012) | $ 1,772,563 | $ 2,384,721 | $ 5,915,743
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders Plus: | 14,815,248 | 14,749,249 | 14,803,216 | 14,734,799
Weighted average number of preferred shares outstanding during the period | 37,719 | 40,194 | 38,516 | 38,510
Potential dilutive effect of unexercised options and unvested stock grants | 0 | 12,879 | 98,903 | 14,595
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 14,852,967 | 14,802,322 | 14,940,635 | 14,787,904

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