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11. Land use right, net (Details) (CNY) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
ZHEJIANG TIANLAN |  |  |
Land use right | 7,361 us-gaap_FiniteLivedContractualRightsGross / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 7,361 us-gaap_FiniteLivedContractualRightsGross / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |
Less: Accumulated amortisation | (1,316)CLWT_LandUseRightAccumulatedAmortisation / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | (1,167)CLWT_LandUseRightAccumulatedAmortisation / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |
Net | 6,045 CLWT_FiniteLivedIntangibleAssetContractualRightNetLandUseRight / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 6,194 CLWT_FiniteLivedIntangibleAssetContractualRightNetLandUseRight / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |
Amortisation expense | 149 CLWT_AmortisationExpenseLandUseRight / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 141 CLWT_AmortisationExpenseLandUseRight / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 177 CLWT_AmortisationExpenseLandUseRight / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember
ZHEJIANG JIAHUAN |  |  |
Land use right | 7,987 us-gaap_FiniteLivedContractualRightsGross / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 7,987 us-gaap_FiniteLivedContractualRightsGross / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member |
Less: Accumulated amortisation | (1,373)CLWT_LandUseRightAccumulatedAmortisation / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | (1,210)CLWT_LandUseRightAccumulatedAmortisation / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member |
Net | 6,614 CLWT_FiniteLivedIntangibleAssetContractualRightNetLandUseRight / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 6,777 CLWT_FiniteLivedIntangibleAssetContractualRightNetLandUseRight / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member |
Amortisation expense | 163 CLWT_AmortisationExpenseLandUseRight / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 163 CLWT_AmortisationExpenseLandUseRight / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 163 CLWT_AmortisationExpenseLandUseRight / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | CLWT_AmortisationExpenseLandUseRight
Namespace Prefix: | CLWT_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | CLWT_FiniteLivedIntangibleAssetContractualRightNetLandUseRight
Namespace Prefix: | CLWT_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | CLWT_LandUseRightAccumulatedAmortisation
Namespace Prefix: | CLWT_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of an intangible asset that arises from a contractual arrangement with a third party (not including franchise rights and license agreements). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedContractualRightsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_SubsidiaryIssuerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |