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Dividends (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Per Share Declared | $ 0.085 | $ 0.085 | $ 0.085 | $ 0.085 | $ 0.085 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.34 | $ 0.31

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- Definition Aggregate dividends declared during the period for each share of common stock and redeemable preferred stock outstanding. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DividendsPayableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration