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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2017
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:
 
 
 
Three Months Ended September 30,
 
 
Nine Months Ended September 30,
 
 
 
2017
 
 
2016
 
 
2017
 
 
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
 
 
 
-
 
 
 
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