Earnings per share (Tables)

6 Months Ended

Jun. 30, 2013

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 for the three and six months ended June 30, 2013 and 2012.

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Net income attributable to Consolidated Water Co. Ltd.     common stockholders	$	2,853,850	$	1,957,492	$	6,595,853	$	4,300,158
Less: preferred stock dividends		(2,996)		(2,421)		(5,991)		(4,842)
Net income available to common shares in the determination of     basic earnings per common share	$	2,850,854	$	1,955,071	$	6,589,862	$	4,295,316
Weighted average number of common shares in the     determination of basic earnings per common share     attributable to Consolidated Water Co. Ltd. common     stockholders		14,636,916		14,579,496		14,617,613		14,574,689
Plus:
Weighted average number of preferred shares outstanding     during the period		31,998		24,082		30,944		23,187
Potential dilutive effect of unexercised options		15,601		274		11,036		178
Weighted average number of shares used for determining     diluted earnings per common share attributable to     Consolidated Water Co. Ltd. common     stockholders		14,684,515		14,603,852		14,659,593		14,598,054