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Loans receivable (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2012
Two loans originally aggregating $10,996,290, bearing interest at 6.5% per annum, receivable in monthly installments of $124,827 to May 2019, and secured by the machinery and equipment of the North Side Water Works plant [Member] |
Loans Receivable Face Amount | $ 10,996,290
Loans Receivable Interest Rate Stated Percentage | 6.50%
Loans Receivable Monthly Instalment | 124,827
Loans Receivable Maturity Date | May 31, 2019
Two loans originally aggregating $1,738,000, bearing interest at 5% per annum, receivable in monthly installments of $24,565 to March 2014, and secured by the machinery and equipment of the North Sound plant [Member] |
Loans Receivable Face Amount | 1,738,000
Loans Receivable Interest Rate Stated Percentage | 5.00%
Loans Receivable Monthly Instalment | 24,565
Loans Receivable Maturity Date | Mar. 31, 2014
Two loans originally aggregating $3,671,039, bearing interest at 6.5% per annum, receivable in monthly installments of $54,513 to June 2017, and secured by the machinery and equipment of the Red Gate plant [Member] |
Loans Receivable Face Amount | 3,671,039
Loans Receivable Interest Rate Stated Percentage | 6.50%
Loans Receivable Monthly Instalment | 54,513
Loans Receivable Maturity Date | Jun. 30, 2017
Two loans originally aggregating $897,000, bearing interest at 5% per annum, receivable in monthly installments of $12,678 to January 2013, and secured by the machinery and equipment of the Lower Valley plant [Member] |
Loans Receivable Face Amount | 897,000
Loans Receivable Interest Rate Stated Percentage | 5.00%
Loans Receivable Monthly Instalment | $ 12,678
Loans Receivable Maturity Date | Jan. 31, 2013

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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:dateItemType
Balance Type: | na
Period Type: | duration

X
- 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