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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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