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Accounting policies - Property, plant and equipment (Details) | Dec. 31, 2023
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Property, Plant and Equipment, Estimated Useful Lives | us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember
Building [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 40 years
Building [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 5 years
Plant And Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 40 years
Plant And Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 4 years
Distribution Systems [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 40 years
Distribution Systems [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Office furniture, fixtures and equipment [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 10 years
Office furniture, fixtures and equipment [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Vehicles [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 10 years
Vehicles [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Lab equipment [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 10 years
Lab equipment [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 5 years

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Indicates description of term of useful life for property, plant, and equipment when not stated as numeric value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482190/360-10-35-3 + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLifeDescriptionOfTermExtensibleEnumeration
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cwco_PlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cwco_DistributionSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cwco_LabEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |