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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 | $ 199,528 cwco_CapitalCommitments |  |
Construction In Progress Placed In Service | 2,693,622 cwco_ConstructionInProgressPlacedInService | 4,924,980 cwco_ConstructionInProgressPlacedInService |
Depreciation | $ 5,355,771 us-gaap_Depreciation | $ 5,113,589 us-gaap_Depreciation | $ 7,381,759 us-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

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- 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

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- 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

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