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Bank borrowings (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ZHEJIANG TIANLAN
Bank loan	¥ 45,000	¥ 33,000
ZHEIJIANG Bank loan borrowed by the Company
Bank loan	40,000	28,000
ZHEIJIANG Bank loan borrowed by a subsidiary of the Company
Bank loan	¥ 5,000	¥ 5,000

X

- Definition

Amount of short-term bank loan secured by broker-dealer customer's security.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

+ Details

Name:	srt_BankLoans
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_StatementScenarioAxis=srt_SubsidiaryIssuerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=CLWT_BankLoanBorrowedByTheCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=CLWT_BankLoanBorrowedByASubsidiaryOfTheCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: