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Land use right net (Details Narrative) - CNY (¥)	Dec. 31, 2021	Dec. 31, 2020
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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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: