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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following summarizes information related to the computation of basic and diluted EPS for the three and six months ended June 30, 2016 and 2015.
 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
 
2016
 
2015
 
2016
 
2015
 
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
 
 
14,792,053
 
 
14,736,057
 
 
14,787,716
 
 
14,727,455
 
Plus:
 
 
 
 
 
 
 
 
 
 
 
 
 
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