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Earnings per share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2014 and 2013.
 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
 
2014
 
2013
 
2014
 
2013
 
Net income attributable to Consolidated Water Co. Ltd. Common stockholders
 
$
2,759,693
 
$
2,853,850
 
$
3,414,602
 
$
6,595,853
 
Less: preferred stock dividends
 
 
(3,139)
 
 
(2,996)
 
 
(6,278)
 
 
(5,991)
 
Net income available to common shares in the determination of basic earnings per common share
 
$
2,756,554
 
$
2,850,854
 
$
3,408,324
 
$
6,589,862
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,698,499
 
 
14,636,916
 
 
14,692,654
 
 
14,617,613
 
Plus:
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of preferred shares outstanding during the period
 
 
37,990
 
 
31,998
 
 
37,701
 
 
30,944
 
Potential dilutive effect of unexercised options
 
 
23,670
 
 
15,601
 
 
33,703
 
 
11,036
 
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,760,159
 
 
14,684,515
 
 
14,764,058
 
 
14,659,593