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9B. Land use right, net (Details) (ZHEJIANG, CNY) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
ZHEJIANG |  |  |
Land use right | 7,315 | 7,315 |
Less: Accumulated amortisation | (980) | (831) |
Net | 6,335 | 6,484 |
Amortisation expense | 177 | 148 | 546

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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=7658586&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedContractualRightsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant