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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015 and 2014.
  
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
 
2015
 
2014
 
2015
 
2014
 
Net income attributable to Consolidated Water Co. Ltd. common stockholders
 
$
1,775,500
 
$
1,882,692
 
$
5,924,861
 
$
5,297,294
 
Less: preferred stock dividends
 
 
(2,937)
 
 
(2,777)
 
 
(9,118)
 
 
(8,722)
 
Net income available to common shares in the determination of basic earnings per common share
 
$
1,772,563
 
$
1,879,915
 
$
5,915,743
 
$
5,288,572
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,749,249
 
 
14,700,939
 
 
14,734,799
 
 
14,695,446
 
Plus:
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of preferred shares outstanding during the period
 
 
40,194
 
 
39,348
 
 
38,510
 
 
38,256
 
Potential dilutive effect of unexercised options
 
 
12,879
 
 
23,627
 
 
14,595
 
 
30,425
 
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,802,322
 
 
14,763,914
 
 
14,787,904
 
 
14,764,127