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Discontinued operations - CW-Belize (Details Textual) - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 07, 2019	Feb. 14, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Proceeds From Repatriated Funds	$ 1,100,000		$ 1,000,000	$ 2,750,000	$ 458,000	$ 400,000
Disposal Group, Including Discontinued Operation, Consideration		$ 7,000,000
Proceeds from Divestiture of Businesses		6,735,000
Contingent Consideration For Other Obligations		$ 265,000

X

- Definition

Contingent consideration for other obligations

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Proceeds from repatriated funds

+ References

No definition available.

+ Details

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Namespace Prefix:	cwco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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