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Land use right net (Details Narrative) - CNY (¥) | Dec. 31, 2021 | Dec. 31, 2020
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ZHEJIANG TIANLAN |  |
Land use right pledged bank loan | ¥ 1,463,000 | ¥ 4,463,000

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

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- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |