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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
 
 
Year Ended December 31,
 
 
 
2015
 
2014
 
2013
 
Net income attributable to Consolidated Water Co. Ltd. stockholders
 
$
7,518,701
 
$
6,265,358
 
$
8,594,519
 
Less: preferred stock dividends
 
 
(12,028)
 
 
(11,485)
 
 
(11,222)
 
Net income available to common shares in the determination of basic earnings per common share
 
$
7,506,673
 
$
6,253,873
 
$
8,583,297
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,741,748
 
 
14,697,896
 
 
14,633,884
 
Plus:
 
 
 
 
 
 
 
 
 
 
Weighted average number of preferred shares outstanding during the period
 
 
38,612
 
 
37,924
 
 
34,827
 
Potential dilutive effect of unexercised options and unvested stock grants
 
 
47,395
 
 
28,503
 
 
35,169
 
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,827,755
 
 
14,764,323
 
 
14,703,880