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Short term borrowings (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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ZHEJIANG TIANLAN |  |
Bank loan | ¥ 33,000 | ¥ 25,000
ZHEIJIANG Bank loan borrowed by the Company |  |
Bank loan | 28,000 | 20,000
ZHEIJIANG Bank loan borrowed by a subsidiary of the Company |  |
Bank loan | ¥ 5,000 | ¥ 5,000

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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