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Supplemental disclosure of cash flow information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplemental Disclosure Of Cash Flow Information [Line Items] |  |  |
Interest paid in cash | $ 196,768 us-gaap_InterestPaidNet | $ 380,014 us-gaap_InterestPaidNet | $ 670,042 us-gaap_InterestPaidNet
Non-cash transactions: |  |  |
Transfers from inventory to property plant and equipment, net and construction in progress | 168,622 cwco_TransfersBetweenInventoryAndPropertyPlantAndEquipment | 181,875 cwco_TransfersBetweenInventoryAndPropertyPlantAndEquipment | 508,107 cwco_TransfersBetweenInventoryAndPropertyPlantAndEquipment
Transfers from construction in progress to property, plant and equipment, net | 2,693,622 cwco_NonCashTransactionsTransfersFromConstructionInProgressToPropertyPlantAndEquipmentNet | 4,924,980 cwco_NonCashTransactionsTransfersFromConstructionInProgressToPropertyPlantAndEquipmentNet | 278,214 cwco_NonCashTransactionsTransfersFromConstructionInProgressToPropertyPlantAndEquipmentNet
Transfer from construction in progress to costs and estimated earnings in excess of billings | 1,090,489 us-gaap_UnbilledContractsReceivable | 0 us-gaap_UnbilledContractsReceivable | 0 us-gaap_UnbilledContractsReceivable
Issuance of 18,294, 25,111 and 21,686, respectively, shares of common stock for services rendered | 263,098 cwco_CommonStockIssuedDuringPeriodValueIssuedForServices | 217,826 cwco_CommonStockIssuedDuringPeriodValueIssuedForServices | 175,313 cwco_CommonStockIssuedDuringPeriodValueIssuedForServices
Issuance of 5,957, 10,180 and 10,033, respectively, shares of redeemable preferred stock for services rendered | 65,289 cwco_RedeemablePreferredStockIssuedDuringPeriodValueIssuedForServices | 110,249 cwco_RedeemablePreferredStockIssuedDuringPeriodValueIssuedForServices | 77,856 cwco_RedeemablePreferredStockIssuedDuringPeriodValueIssuedForServices
Conversion (on a one-to-one basis) of 4,756, 4,720 and 2,629, respectively, shares of redeemable preferred stock to common stock | 2,854 cwco_NonCashTransactionsConversionOfPreferredStockToCommonStock | 2,832 cwco_NonCashTransactionsConversionOfPreferredStockToCommonStock | 1,577 cwco_NonCashTransactionsConversionOfPreferredStockToCommonStock
Dividends declared but not paid | 1,106,456 us-gaap_DividendsPayableCurrentAndNoncurrent | 1,104,271 us-gaap_DividendsPayableCurrentAndNoncurrent | 1,096,746 us-gaap_DividendsPayableCurrentAndNoncurrent
Obligation incurred for investment in land | $ 0 cwco_LandInvestmentObligation | $ 10,050,000 cwco_LandInvestmentObligation | $ 0 cwco_LandInvestmentObligation

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- Definition Value of common stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders. + References No definition available. + Details
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- Definition Represents the amount of obligation incurred on investment made on land during the reporting period. + References No definition available. + Details
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- Definition Amount of transfers from Construction in Progress to property, plant and equipment, net. + References No definition available. + Details
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- Definition Value of redeemable preferred stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c(3) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6471842&loc=d3e55302-109406 + Details
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