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