XML 37 R26.htm IDEA: XBRL DOCUMENT v3.21.2

Accounting policies - Goodwill and intangible assets (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) customer	Jun. 30, 2021 USD ($) customer	Dec. 31, 2020 USD ($) customer
Goodwill	$ 10,425,013	$ 10,425,013	$ 13,325,013
Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information			100.00%
Estimated Fair Value Carrying Amount Exceeded Percentage			101
Goodwill	1,170,511	1,170,511	$ 1,170,511
Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information			100.00%
Estimated Fair Value Carrying Amount Exceeded Percentage			49
Goodwill	1,948,875	1,948,875	$ 1,948,875
Services [Member]
Estimated Fair Value Percentage Segment Reporting Information			100.00%
Estimated Fair Value Carrying Amount Exceeded Percentage			17
Goodwill	5,320,416	5,320,416	$ 5,320,416
Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information			100.00%
Estimated Fair Value Carrying Amount Exceeded Percentage			31
Goodwill	$ 1,985,211	$ 1,985,211	$ 4,885,211
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] | Services [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			20.00%
Guideline Public Company Method [Member] | Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information			20.00%
Guideline Public Company Method [Member] | Services [Member]
Estimated Fair Value Percentage Segment Reporting Information			20.00%
Guideline Public Company Method [Member] | Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information			20.00%
Aerex
Number of customers | customer	1	1	1
Aerex | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Percentage of total	87.00%	86.00%	80.00%
Aerex | Gross Profit [Member] | Customer Concentration Risk [Member]
Percentage of total	91.00%	84.00%	89.00%
Aerex | Manufacturing Units [Member]
Estimated Fair Value Carrying Amount Exceeded Percentage			31
Goodwill	$ 1,985,211	$ 1,985,211
Impairment of goodwill	2,900,000
Unamortized balance of intangible assets	$ 894,444	$ 894,444
Aerex | Discounted Cash Flow Method [Member] | Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information		80.00%	80.00%
Aerex | Guideline Public Company Method [Member] | Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information		20.00%	20.00%

X

- Definition

Represents the exceeded percentage of estimated fair value of reporting segments.

+ References

No definition available.

+ Details

Name:	cwco_EstimatedFairValueCarryingAmountExceededPercentage
Namespace Prefix:	cwco_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Refers to the number of customers.

+ References

No definition available.

+ Details

Name:	cwco_NumberOfCustomers
Namespace Prefix:	cwco_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

+ Details

Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cwco_SegmentRetailMember
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_ServicesMember
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:	us-gaap_BusinessAcquisitionAxis=cwco_AerexIndustriesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=cwco_GrossProfitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: