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Intangible assets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Cost
Finite-Lived Intangible Assets, Gross	$ 2,678,775us-gaap_FiniteLivedIntangibleAssetsGross	$ 2,678,775us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(1,750,875)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(1,582,287)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible Assets, Net (Excluding Goodwill)	927,900us-gaap_IntangibleAssetsNetExcludingGoodwill	1,096,488us-gaap_IntangibleAssetsNetExcludingGoodwill
Intangible Asset Management Service Agreement [Member]
Cost
Finite-Lived Intangible Assets, Gross	856,356us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_IntangibleAssetManagementServiceAgreementMember	856,356us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_IntangibleAssetManagementServiceAgreementMember
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(660,800)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementClassOfStockAxis = cwco_IntangibleAssetManagementServiceAgreementMember	(570,904)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementClassOfStockAxis = cwco_IntangibleAssetManagementServiceAgreementMember
Belize Water Production And Supply Agreement [Member]
Cost
Finite-Lived Intangible Assets, Gross	1,522,419us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_BelizeWaterProductionAndSupplyAgreementMember	1,522,419us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_BelizeWaterProductionAndSupplyAgreementMember
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(790,075)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementClassOfStockAxis = cwco_BelizeWaterProductionAndSupplyAgreementMember	(723,883)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementClassOfStockAxis = cwco_BelizeWaterProductionAndSupplyAgreementMember
Option agreement [Member]
Cost
Finite-Lived Intangible Assets, Gross	300,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_OptionAgreementMember	300,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_OptionAgreementMember
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	$ (300,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementClassOfStockAxis = cwco_OptionAgreementMember	$ (287,500)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementClassOfStockAxis = cwco_OptionAgreementMember

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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