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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2013
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, 2013 and 2012.
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2013
 
2012
 
2013
 
2012
 
Net income attributable to Consolidated Water
     Co. Ltd. Common stockholders
$
908,690
 
$
1,304,843
 
$
7,504,542
 
$
5,605,001
 
Less: preferred stock dividends
 
(2,885)
 
 
(2,270)
 
 
(8,655)
 
 
(6,810)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income available to common shares in the
     determination of basic earnings per common
     share
$
905,805
 
$
1,302,573
 
$
7,495,887
 
$
5,598,191
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of common shares in
     the determination of basic earnings per
     common share attributable to Consolidated
     Water Co. Ltd. common stockholders
 
14,644,740
 
 
14,580,946
 
 
14,626,755
 
 
14,576,790
 
Plus:
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of preferred shares
    outstanding during the period
 
39,680
 
 
31,504
 
 
33,888
 
 
25,980
 
Potential dilutive effect of unexercised options
 
50,496
 
 
4,745
 
 
21,543
 
 
1,628
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of shares used for
     determining diluted earnings per common
     share attributable to Consolidated Water Co.
     Ltd. common stockholders
 
14,734,916
 
 
14,617,195
 
 
14,682,186
 
 
14,604,398