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

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- 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

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

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- 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: |