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Investment in OC-BVI (Details) (Ocean Conversion (BVI) Ltd [Member], USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Ocean Conversion (BVI) Ltd [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | $ 3,168,940 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember | $ 2,547,542 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember
Non-current assets | 5,116,946 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember | 5,297,904 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember
Total assets | 8,285,886 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember | 7,845,446 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember
Current liabilities | 624,794 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember | 427,269 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember
Non-current liabilities | 1,445,849 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember | 1,393,200 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember
Total liabilities | $ 2,070,643 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember | $ 1,820,469 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / dei_LegalEntityAxis = cwco_OceanConversionBviLtdMember

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