XML 23 R54.htm IDEA: XBRL DOCUMENT v3.20.1

Accounting policies - Weighted the fair values estimated (Details)	12 Months Ended
	Dec. 31, 2019
Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information	100.00%
Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information	100.00%
Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information	100.00%
Discounted Cash Flow Method [Member] | Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information	80.00%
Discounted Cash Flow Method [Member] | Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information	80.00%
Discounted Cash Flow Method [Member] | Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information	80.00%
Guideline Public Company Method [Member] | Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Guideline Public Company Method [Member] | Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Guideline Public Company Method [Member] | Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Mergers And Acquisitions Method [Member] | Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Mergers And Acquisitions Method [Member] | Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Mergers And Acquisitions Method [Member] | Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%

X

- Definition

Represents the estimated fair value of reporting segments.

+ References

No definition available.

+ Details

Name:	cwco_EstimatedFairValuePercentageSegmentReportingInformation
Namespace Prefix:	cwco_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_RetailMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cwco_BulkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cwco_ManufacturingUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cwco_FairValueDeterminingMethodAxis=cwco_DiscountedCashFlowMethodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cwco_FairValueDeterminingMethodAxis=cwco_GuidelinePublicCompanyMethodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cwco_FairValueDeterminingMethodAxis=cwco_MergersAndAcquisitionsMethodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: