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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2014 and 2013.
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
 
2014
 
2013
 
2014
 
2013
 
Net income attributable to Consolidated Water Co. Ltd. Common stockholders
 
$
1,882,692
 
$
908,690
 
$
5,297,294
 
$
7,504,542
 
Less: preferred stock dividends
 
 
(2,777)
 
 
(2,885)
 
 
(8,722)
 
 
(8,655)
 
Net income available to common shares in the determination of basic earnings per common share
 
$
1,879,915
 
$
905,805
 
$
5,288,572
 
$
7,495,887
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,700,939
 
 
14,644,740
 
 
14,695,446
 
 
14,626,755
 
Plus:
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of preferred shares outstanding during the period
 
 
39,348
 
 
39,680
 
 
38,256
 
 
33,888
 
Potential dilutive effect of unexercised options
 
 
23,627
 
 
50,496
 
 
30,425
 
 
21,543
 
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,763,914
 
 
14,734,916
 
 
14,764,127
 
 
14,682,186