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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2018
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 June 30,
 
 
Six Months Ended June 30,
 
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
Net income attributable to Consolidated Water Co. Ltd. stockholders
 
$
2,188,193
 
 
$
624,548
 
 
$
4,280,718
 
 
$
3,255,776
 
Less: preferred stock dividends
 
 
(3,488
)
 
 
(3,382
)
 
 
(6,296
)
 
 
(6,023
)
Net income available to common shares in the determination of basic earnings per common share
 
$
2,184,705
 
 
$
621,166
 
 
$
4,274,422
 
 
$
3,249,753
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
14,959,309
 
 
 
14,889,816
 
 
 
14,959,284
 
 
 
14,880,889
 
Plus:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of preferred shares outstanding during the period
 
 
34,442
 
 
 
36,684
 
 
 
33,767
 
 
 
35,958
 
Potential dilutive effect of unexercised options and unvested stock grants
 
 
123,975
 
 
 
129,054
 
 
 
123,661
 
 
 
128,357
 
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders
 
 
15,117,726
 
 
 
15,055,554
 
 
 
15,116,712
 
 
 
15,045,204