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

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-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

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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)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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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)

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-Paragraph 17

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