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15A. Amount due to a shareholder | 12 Months Ended
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Dec. 31, 2015
ZHEJIANG JIAHUAN |
Amount due to a shareholder | The amount due to a shareholder do not bear any interest, unsecured and do not have clearly defined terms of repayment.

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Name: | CLWT_AmountDueToShareholderDisclosureTextBlock
Namespace Prefix: | CLWT_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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Name: | us-gaap_StatementScenarioAxis=CLWT_Subsidiary2Member
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Data Type: | na
Balance Type: |
Period Type: |