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Cash and cash equivalents (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | $ 22,760,231 us-gaap_CashEquivalentsAtCarryingValue | $ 22,058,252 us-gaap_CashEquivalentsAtCarryingValue |  |
Short term deposits | 12,953,458 us-gaap_DepositsAssetsCurrent | 11,568,264 us-gaap_DepositsAssetsCurrent |  |
Total cash and cash equivalents | 35,713,689 us-gaap_CashAndCashEquivalentsAtCarryingValue | 33,626,516 us-gaap_CashAndCashEquivalentsAtCarryingValue | 33,892,655 us-gaap_CashAndCashEquivalentsAtCarryingValue | 37,624,179 us-gaap_CashAndCashEquivalentsAtCarryingValue
United States dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 7,809,107 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_UnitedStatesDollarMember | 10,484,207 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_UnitedStatesDollarMember |  |
Short term deposits | 474,728 us-gaap_DepositsAssetsCurrent / us-gaap_StatementClassOfStockAxis = cwco_UnitedStatesDollarMember | 527,580 us-gaap_DepositsAssetsCurrent / us-gaap_StatementClassOfStockAxis = cwco_UnitedStatesDollarMember |  |
Cayman Islands dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 4,274,025 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_CaymanIslandsDollarMember | 5,275,615 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_CaymanIslandsDollarMember |  |
Bahamian dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 6,822,761 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_BahamianDollarMember | 3,090,021 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_BahamianDollarMember |  |
Short term deposits | 12,478,730 us-gaap_DepositsAssetsCurrent / us-gaap_StatementClassOfStockAxis = cwco_BahamianDollarMember | 11,040,684 us-gaap_DepositsAssetsCurrent / us-gaap_StatementClassOfStockAxis = cwco_BahamianDollarMember |  |
Belize dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 3,658,705 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_BelizeDollarMember | 3,055,990 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_BelizeDollarMember |  |
Bermudian dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 5,507 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_BermudianDollarMember | 6,759 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_BermudianDollarMember |  |
Mexican Peso [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 53,203 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_MexicanPesoMember | 11,227 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_MexicanPesoMember |  |
Euro [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 30,291 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_EuroMember | 22,731 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_EuroMember |  |
Singapore dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 27,641 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_SingaporedollarMember | 27,644 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_SingaporedollarMember |  |
Indonesian Rupiah [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | $ 78,991 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_IndonesianRupiahMember | $ 84,058 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_StatementClassOfStockAxis = cwco_IndonesianRupiahMember |  |

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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