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Earnings per share (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Net income (loss) attributable to Consolidated Water Co. Ltd. stockholders | $ 1,161,139 | $ (1,865,332) | $ 4,416,915 | $ 2,393,642
Less: preferred stock dividends | (2,548) | (2,680) | (8,571) | (8,921)
Net income (loss) available to common shares in the determination of basic earnings per common share | $ 1,158,591 | $ (1,868,012) | $ 4,408,344 | $ 2,384,721
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 14,898,246 | 14,815,248 | 14,886,738 | 14,803,216
Plus: |  |  |  |
Weighted average number of preferred shares outstanding during the period | 45,087 | 37,719 | 39,035 | 38,516
Potential dilutive effect of unexercised options and unvested stock grants | 128,809 | 0 | 128,570 | 98,903
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 15,072,142 | 14,852,967 | 15,054,343 | 14,940,635

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