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Earnings per share (Tables)

6 Months Ended

Jun. 30, 2012

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, 2012 and 2011.

		Three Months Ended June 30,								Six Months Ended June 30,
		2012				2011				2012				2011
Net income attributable to Consolidated Water Co. Ltd. common stockholders		$	1,957,492			$	1,929,662			$	4,300,158			$	3,922,672
Less: Preferred stock dividends			(2,421	)			(1,921	)			(4,842	)			(3,851	)
Net income available to common shares in the determination of basic earnings per common share		$	1,955,071			$	1,927,741			$	4,295,316			$	3,918,821

Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders			14,579,496				14,558,937				14,574,689				14,557,606
Plus:
Weighted average number of preferred shares outstanding during the period			24,082				17,725				23,187				17,174
Potential dilutive effect of unexercised options			274				18,423				178				22,263
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders			14,603,852				14,595,085				14,598,054				14,597,043