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Commitments and contingencies (Details Narrative) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)
Rental expenses | $	$ 324		$ 297		$ 297
ZHEJIANG TIANLAN
Rental expenses		¥ 0		¥ 0		¥ 0
ZHEJIANG JIAHUAN
Rental expenses		¥ 0		¥ 0		¥ 0

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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