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Accounting policies - Cash and cash equivalents (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |
Cash Equivalents, at Carrying Value | $ 9,275,893 | $ 13,362,649
Cash, Uninsured Amount | 10,300,000 |
Cash And Restricted Cash Equivalents Held In Foreign Bank | 32,800,000 |
Bahamas [Member] |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |
Deposits held in foreign bank | 15,900,000 |
Certificates of Deposit [Member] |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |
Cash Equivalents, at Carrying Value | $ 8,500,000 | $ 12,700,000

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- Definition Represents the amount cash held in foreign bank accounts including restricted cash. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of deposits held in foreign banks, as stated in equivalent United States dollars. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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- Details
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- Details
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