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v3.20.1

Summary of significant accounting policies (Details 1) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Engineering segment backlog | $ 8,611 | $ 4,303

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

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