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Earnings per share (Tables)
 3 Months Ended
Mar. 31, 2017
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:
 
 
 
Three Months Ended March 31,
 
 
 
2017
 
2016
 
Net income attributable to Consolidated Water Co. Ltd. stockholders
 
$
2,631,228
 
$
2,054,641
 
Less: preferred stock dividends
 
 
(2,642)
 
 
(2,850)
 
Net income available to common shares in the determination of basic earnings per common share
 
$
2,628,586
 
$
2,051,791
 
 
 
 
 
 
 
 
 
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,871,862
 
 
14,783,380
 
Plus:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of preferred shares outstanding during the period
 
 
35,225
 
 
38,584
 
 
 
 
 
 
 
 
 
Potential dilutive effect of unexercised options and unvested stock grants
 
 
128,132
 
 
42,161
 
 
 
 
 
 
 
 
 
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
15,035,219
 
 
14,864,125