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Financial instruments (Details 1) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Financial Instruments [Line Items] |  |  |
Balance, Beginning | $ 6,623,448 us-gaap_EquityMethodInvestments |  |
Profit sharing and equity from earnings of OC-BVI | 414,755 cwco_IncomeLossFromEquityMethodInvestmentsAndSubsidiaries | 1,337,352 cwco_IncomeLossFromEquityMethodInvestmentsAndSubsidiaries | 2,464,773 cwco_IncomeLossFromEquityMethodInvestmentsAndSubsidiaries
Distributions received from OC-BVI | (969,600)us-gaap_EquityMethodInvestmentDividendsOrDistributions | (1,439,250)us-gaap_EquityMethodInvestmentDividendsOrDistributions | (2,287,650)us-gaap_EquityMethodInvestmentDividendsOrDistributions
Impairment of Investment in OC-BVI (See Note 8) | (860,000)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | (200,000)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Balance, Ending | $ 5,208,603 us-gaap_EquityMethodInvestments | $ 6,623,448 us-gaap_EquityMethodInvestments |

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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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