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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities      
Net income $ 6,764,540us-gaap_ProfitLoss $ 9,148,489us-gaap_ProfitLoss $ 9,624,009us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 5,524,359us-gaap_DepreciationAndAmortization 5,472,116us-gaap_DepreciationAndAmortization 7,728,568us-gaap_DepreciationAndAmortization
Amortization of NRW costs 179,353cwco_AmortizationOfNonrevenueWaterCosts 179,353cwco_AmortizationOfNonrevenueWaterCosts 179,353cwco_AmortizationOfNonrevenueWaterCosts
Provision for doubtful accounts 0us-gaap_ProvisionForDoubtfulAccounts 32,933us-gaap_ProvisionForDoubtfulAccounts 62,909us-gaap_ProvisionForDoubtfulAccounts
Compensation expense relating to stock and stock option grants 202,454us-gaap_ShareBasedCompensation 381,976us-gaap_ShareBasedCompensation 453,686us-gaap_ShareBasedCompensation
Net (gain) loss on disposal of fixed assets 77,495us-gaap_GainLossOnSaleOfPropertyPlantEquipment 14,562us-gaap_GainLossOnSaleOfPropertyPlantEquipment (12,082)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Foreign currency transaction adjustment 107,839us-gaap_ForeignCurrencyTransactionGainLossUnrealized 244,225us-gaap_ForeignCurrencyTransactionGainLossUnrealized 0us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Profit sharing and equity in earnings of OC-BVI (414,755)cwco_IncomeLossFromEquityMethodInvestmentsAndSubsidiaries (1,337,352)cwco_IncomeLossFromEquityMethodInvestmentsAndSubsidiaries (2,464,773)cwco_IncomeLossFromEquityMethodInvestmentsAndSubsidiaries
Impairment losses 860,000cwco_ImpairmentLossesAttributableToGoodwillLonglivedAssetsOrInvestmentInAffiliate 200,000cwco_ImpairmentLossesAttributableToGoodwillLonglivedAssetsOrInvestmentInAffiliate 521,444cwco_ImpairmentLossesAttributableToGoodwillLonglivedAssetsOrInvestmentInAffiliate
Unrealized gain on marketable securities 0us-gaap_TradingSecuritiesUnrealizedHoldingGain (17,137)us-gaap_TradingSecuritiesUnrealizedHoldingGain (73,966)us-gaap_TradingSecuritiesUnrealizedHoldingGain
Change in:      
Accounts receivable 7,079,012us-gaap_IncreaseDecreaseInAccountsReceivable (6,387,463)us-gaap_IncreaseDecreaseInAccountsReceivable (4,092,859)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory (566,928)us-gaap_IncreaseDecreaseInInventories (65,637)us-gaap_IncreaseDecreaseInInventories (922,840)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets 449,861us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (110,192)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (859,147)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and other liabilities (985,560)us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities 1,987,661us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities 1,412,524us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities
Net cash provided by operating activities 19,277,670us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 9,743,534us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 11,556,826us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities      
Purchase of certificate of deposit (5,000,000)us-gaap_PaymentsToAcquireRestrictedCertificatesOfDeposit 0us-gaap_PaymentsToAcquireRestrictedCertificatesOfDeposit 0us-gaap_PaymentsToAcquireRestrictedCertificatesOfDeposit
Sale of marketable securities 8,587,475us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment 0us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment 0us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
Additions to property, plant and equipment and construction in progress (4,716,769)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,315,389)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,574,173)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of equipment 13,620us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 13,740us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Distribution of earnings from OC-BVI 969,600us-gaap_EquityMethodInvestmentDividendsOrDistributions 1,439,250us-gaap_EquityMethodInvestmentDividendsOrDistributions 2,287,650us-gaap_EquityMethodInvestmentDividendsOrDistributions
Collections on loans receivable 1,691,102us-gaap_ProceedsFromCollectionOfLoansReceivable 1,812,533us-gaap_ProceedsFromCollectionOfLoansReceivable 1,753,771us-gaap_ProceedsFromCollectionOfLoansReceivable
Payment for investment in land (7,382,858)us-gaap_PaymentsToAcquireLand (3,125,566)us-gaap_PaymentsToAcquireLand 0us-gaap_PaymentsToAcquireLand
Payment of land purchase obligation (10,050,000)cwco_PaymentsToLandPurchaseObligation 0cwco_PaymentsToLandPurchaseObligation 0cwco_PaymentsToLandPurchaseObligation
Payment for NSC option agreement 0cwco_PaymenTforNscOptionAgreement 0cwco_PaymenTforNscOptionAgreement (300,000)cwco_PaymenTforNscOptionAgreement
Restriction on cash balance (456,083)us-gaap_IncreaseDecreaseInRestrictedCash 0us-gaap_IncreaseDecreaseInRestrictedCash 7,500,000us-gaap_IncreaseDecreaseInRestrictedCash
Net cash provided by (used in) investing activities (16,343,913)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (4,175,432)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 6,667,248us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities      
Dividends paid (4,583,173)us-gaap_PaymentsOfDividends (4,399,091)us-gaap_PaymentsOfDividends (4,450,392)us-gaap_PaymentsOfDividends
Repurchase of redeemable preferred stock, net (13,077)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock 9,313us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock 1,154us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock
Proceeds received from exercise of stock options 52,551us-gaap_ProceedsFromStockOptionsExercised 500,505us-gaap_ProceedsFromStockOptionsExercised 0us-gaap_ProceedsFromStockOptionsExercised
Principal repayments of long term debt (5,301,327)us-gaap_RepaymentsOfLongTermDebt (1,724,025)us-gaap_RepaymentsOfLongTermDebt (10,125,150)us-gaap_RepaymentsOfLongTermDebt
Capital contribution from non-controlling interest 0us-gaap_ProceedsFromMinorityShareholders 142,105us-gaap_ProceedsFromMinorityShareholders 135,000us-gaap_ProceedsFromMinorityShareholders
Repayment of non-revolving credit facility 0us-gaap_RepaymentsOfLinesOfCredit 0us-gaap_RepaymentsOfLinesOfCredit (7,500,000)us-gaap_RepaymentsOfLinesOfCredit
Proceeds received from demand loan payable 10,000,000us-gaap_ProceedsFromNotesPayable 0us-gaap_ProceedsFromNotesPayable 0us-gaap_ProceedsFromNotesPayable
Repayments of demand loan payable (1,000,000)us-gaap_RepaymentsOfOtherShortTermDebt 0us-gaap_RepaymentsOfOtherShortTermDebt 0us-gaap_RepaymentsOfOtherShortTermDebt
Net cash used in financing activities (845,026)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (5,471,193)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (21,939,388)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash (1,558)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (363,048)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (16,210)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents 2,087,173us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (266,139)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,731,524)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 33,626,516us-gaap_CashAndCashEquivalentsAtCarryingValue 33,892,655us-gaap_CashAndCashEquivalentsAtCarryingValue 37,624,179us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 35,713,689us-gaap_CashAndCashEquivalentsAtCarryingValue $ 33,626,516us-gaap_CashAndCashEquivalentsAtCarryingValue $ 33,892,655us-gaap_CashAndCashEquivalentsAtCarryingValue