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12. Short term borrowings (Details) (CNY) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ZHEJIANG TIANLAN
Bank loan	97,900us-gaap_BankLoans / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember	64,690us-gaap_BankLoans / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember
ZHEIJIANG Bank loan borrowed by the Company
Bank loan	92,900us-gaap_BankLoans / us-gaap_DebtInstrumentAxis = CLWT_BankLoanBorrowedByTheCompanyMember	59,690us-gaap_BankLoans / us-gaap_DebtInstrumentAxis = CLWT_BankLoanBorrowedByTheCompanyMember
ZHEIJIANG Bank loan borrowed by a subsidiary of the Company
Bank loan	5,000us-gaap_BankLoans / us-gaap_DebtInstrumentAxis = CLWT_BankLoanBorrowedByASubsidiaryOfTheCompanyMember	5,000us-gaap_BankLoans / us-gaap_DebtInstrumentAxis = CLWT_BankLoanBorrowedByASubsidiaryOfTheCompanyMember

X

- Definition

Amounts due on short-term bank loans secured by customers' securities on the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_BankLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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