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Loans receivable (Details Textual) | 12 Months Ended
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Dec. 31, 2016 USD ($)
Two loans originally aggregating $10,996,290, bearing interest at 6.5% per annum, receivable in aggregate monthly installments of $124,827 to June 2019, and secured by the machinery and equipment of the North Side Water Works plant [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans Receivable Face Amount | $ 10,996,290
Loans Receivable Interest Rate Stated Percentage | 6.50%
Loans Receivable Monthly Installment | $ 124,827
Loans Receivable Maturity Date | Jun. 30, 2019
Two loans originally aggregating $3,671,039, bearing interest at 6.5% per annum, receivable in aggregate monthly installments of $54,513 to June 2017, and secured by the machinery and equipment of the Red Gate plant [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans Receivable Face Amount | $ 3,671,039
Loans Receivable Interest Rate Stated Percentage | 6.50%
Loans Receivable Monthly Installment | $ 54,513
Loans Receivable Maturity Date | Jun. 30, 2017

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- Definition The stated principal amount of the loans receivable. + References No definition available. + Details
Name: | cwco_LoansReceivableFaceAmount
Namespace Prefix: | cwco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest rate stated in the contractual loans receivable agreement. + References No definition available. + Details
Name: | cwco_LoansReceivableInterestRateStatedPercentage
Namespace Prefix: | cwco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Date when the loans receivable is scheduled to be fully received, in CCYY-MM-DD format. + References No definition available. + Details
Name: | cwco_LoansReceivableMaturityDate
Namespace Prefix: | cwco_
Data Type: | xbrli:dateTimeItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of the monthly installments receivables including both interest and principal. + References No definition available. + Details
Name: | cwco_LoansReceivableMonthlyInstalment
Namespace Prefix: | cwco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cwco_LoanOneSecuredByMachineryAndEquipmentOfNorthSideWaterWorksPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cwco_LoanThreeSecuredByMachineryAndEquipmentOfRedGatePlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |