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Earnings per share (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2016 and 2015.
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
 
2016
 
2015
 
2016
 
2015
 
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
 
 
14,815,248
 
 
14,749,249
 
 
14,803,216
 
 
14,734,799
 
Plus:
 
 
 
 
 
 
 
 
 
 
 
 
 
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
 
 
-
 
 
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