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Accounting policies - Revenue recognized and billed on services (Details) - USD ($) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Dec. 31, 2020
Accounting policies |  |
Revenue recognized to date on contracts in progress | $ 6,434,715 | $ 17,534,449
Amounts billed to date on contracts in progress | (6,277,688) | (17,791,928)
Retainage | 244,025 | 312,130
Net contract asset | 401,052 | 54,651
Contract assets | 415,633 | 516,521
Contract liabilities | (14,581) | (461,870)
Net contract asset | $ 401,052 | $ 54,651

X
- Definition Amount, after allowance for credit loss and obligation to transfer good or service to customer for which consideration has been received or is receivable, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amounts billed to date on contracts in progress. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | xbrli:monetaryItemType
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X
- Definition Represents the total revenue recognized and amount billed on contracts in progress. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Amount of retainage with contract for customers. + References No definition available. + Details
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Period Type: | duration

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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