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Summary of significant accounting policies (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Summary of significant accounting policies |  |
Engineering segment backlog | $ 4,200 | $ 6,000

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Namespace Prefix: | clwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration