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Property, plant and equipment and construction in progress (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Capital Commitments	$ 199,528cwco_CapitalCommitments
Construction In Progress Placed In Service	2,693,622cwco_ConstructionInProgressPlacedInService	4,924,980cwco_ConstructionInProgressPlacedInService
Depreciation	$ 5,355,771us-gaap_Depreciation	$ 5,113,589us-gaap_Depreciation	$ 7,381,759us-gaap_Depreciation

X

- Definition

Amount of capital commitments outstanding.

+ References

No definition available.

+ Details

Name:	cwco_CapitalCommitments
Namespace Prefix:	cwco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the amount of construction in progress placed in service.

+ References

No definition available.

+ Details

Name:	cwco_ConstructionInProgressPlacedInService
Namespace Prefix:	cwco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration