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Intangible assets (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Cost |  |
Finite-Lived Intangible Assets, Gross | $ 2,678,775 us-gaap_FiniteLivedIntangibleAssetsGross | $ 2,678,775 us-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) | 927,900 us-gaap_IntangibleAssetsNetExcludingGoodwill | 1,096,488 us-gaap_IntangibleAssetsNetExcludingGoodwill
Intangible Asset Management Service Agreement [Member] |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 856,356 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_IntangibleAssetManagementServiceAgreementMember | 856,356 us-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 | 1,522,419 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_BelizeWaterProductionAndSupplyAgreementMember | 1,522,419 us-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 | 300,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementClassOfStockAxis = cwco_OptionAgreementMember | 300,000 us-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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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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