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Commitments and contingencies (Details Textual) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
gal
Dec. 31, 2013
Dec. 31, 2012
Jul. 29, 2011
gal
Commitments And Contingencies [Line Items]        
Operating Leases, Rent Expense, Net $ 812,658us-gaap_OperatingLeasesRentExpenseNet $ 822,159us-gaap_OperatingLeasesRentExpenseNet $ 559,811us-gaap_OperatingLeasesRentExpenseNet  
Royalty Payment Percentage 36.00%cwco_RoyaltyPaymentPercentage 36.00%cwco_RoyaltyPaymentPercentage 37.00%cwco_RoyaltyPaymentPercentage  
Employment Agreement Base Annual Salaries 3,100,000cwco_EmploymentAgreementBaseAnnualSalaries      
Goodwill 3,499,037us-gaap_Goodwill 3,499,037us-gaap_Goodwill    
Retail Water Gross Profit Percentage 53.00%cwco_RetailWaterGrossProfitPercentage 52.00%cwco_RetailWaterGrossProfitPercentage 58.00%cwco_RetailWaterGrossProfitPercentage  
Noncancellable Lease Term Expiration Date 2032      
Payments To Land Purchase Obligation 10,050,000cwco_PaymentsToLandPurchaseObligation 0cwco_PaymentsToLandPurchaseObligation 0cwco_PaymentsToLandPurchaseObligation  
Delivery Terms, Volume of water per day 63,000,000cwco_DeliveryTermsVolumeOfWaterPerDay      
Scenario, Forecast [Member]        
Commitments And Contingencies [Line Items]        
Payments To Land Purchase Obligation 1,400,000cwco_PaymentsToLandPurchaseObligation
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
     
Cw Belize [Member]        
Commitments And Contingencies [Line Items]        
Volume of Water to be supplied (per day)       450,000cwco_VolumeOfWaterToBeSupplied
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= cwco_CwBelizeMember
Retail Segment [Member]        
Commitments And Contingencies [Line Items]        
Goodwill $ 3,499,037us-gaap_Goodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= cwco_RetailSegmentMember