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Earnings per share (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 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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