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v3.22.1

Other taxes payable (Details Narrative) - ZHEJIANG TIANLAN | Dec. 31, 2021 | Dec. 31, 2020
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Minimum [Member] |  |
Valued-Added Tax rate | 3.00% | 3.00%
Maximum [Member] |  |
Valued-Added Tax rate | 13.00% | 13.00%

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Namespace Prefix: | clwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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Name: | srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
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Name: | srt_RangeAxis=srt_MinimumMember
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: |