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Earnings per share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]

15. Earnings per share

 

Earnings per share (“EPS”) are computed on a basic and diluted basis. Basic EPS is computed by dividing net income (less preferred stock dividends) available to common stockholders by the weighted average number of common shares outstanding during the period. The computation of diluted EPS assumes the issuance of common shares for all potential common shares outstanding during the reporting period and, if dilutive, the effect of stock options as computed under the treasury stock method.

 

The following summarizes information related to the computation of basic and diluted EPS for the respective years ended December 31:

 

    Year Ended December 31,  
    2012     2011     2010  
Net income attributable to Consolidated Water Co. Ltd. common stockholders   $ 9,315,514     $ 6,113,218     $ 6,292,025  
Less: preferred stock dividends     (9,080 )     (7,040 )     (5,350 )
Net income available to common shares in the determination of basic earnings per common share   $ 9,306,434     $ 6,106,178     $ 6,286,675  
                         
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders     14,578,518       14,560,259       14,547,065  
Plus:                        
Weighted average number of preferred shares outstanding during the period     27,057       19,892       18,723  
Potential dilutive effect of unexercised options     573       15,862       32,106  
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders     14,606,148       14,596,013       14,597,894