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Earnings per share
 12 Months Ended
Dec. 31, 2013
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,
 
 
 
2013
 
2012
 
2011
 
Net income attributable to Consolidated Water Co. Ltd. Common stockholders
 
$
8,594,519
 
$
9,315,514
 
$
6,113,218
 
Less: preferred stock dividends
 
 
(11,222)
 
 
(9,080)
 
 
(7,040)
 
Net income available to common shares in the determination of basic earnings per common share
 
$
8,583,297
 
$
9,306,434
 
$
6,106,178
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,633,884
 
 
14,578,518
 
 
14,560,259
 
Plus:
 
 
 
 
 
 
 
 
 
 
Weighted average number of preferred shares outstanding during the period
 
 
34,827
 
 
27,057
 
 
19,892
 
Potential dilutive effect of unexercised options
 
 
35,169
 
 
573
 
 
15,862
 
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,703,880
 
 
14,606,148
 
 
14,596,013