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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2012
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, 2012 and 2011.

 

    Three Months Ended 
September 30,		     Nine Months Ended 
September 30,		  
    2012     2011     2012     2011  
Net income attributable to Consolidated Water Co. Ltd. common stockholders   $ 1,304,843     $ 1,286,068     $ 5,605,001     $ 5,208,740  
Less: preferred stock dividends     (2,270 )     (1,716 )     (6,810 )     (5,391 )
Net income available to common shares in the determination of basic earnings per common share   $ 1,302,573     $ 1,284,352     $ 5,598,191     $ 5,203,349  
                                 
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders     14,580,946       14,560,765       14,576,790       14,558,670  
Plus:                                
Weighted average number of preferred shares outstanding during the period     31,504       22,703       25,980       19,038  
Potential dilutive effect of unexercised options     4,745       7,041       1,628       17,960  
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders     14,617,195       14,590,509       14,604,398       14,595,668