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9. Property, plant and equipment (Details 1) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 ZHEJIANG TIANLAN CNY | Dec. 31, 2013 ZHEJIANG TIANLAN CNY | Dec. 31, 2012 ZHEJIANG TIANLAN CNY | Dec. 31, 2014 ZHEJIANG JIAHUAN CNY | Dec. 31, 2013 ZHEJIANG JIAHUAN CNY | Dec. 31, 2012 ZHEJIANG JIAHUAN CNY
Depreciation charge | $ 88 us-gaap_DepreciationAndAmortization | $ 108 us-gaap_DepreciationAndAmortization | $ 130 us-gaap_DepreciationAndAmortization | 2,985 us-gaap_DepreciationAndAmortization / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 2,956 us-gaap_DepreciationAndAmortization / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 3,017 us-gaap_DepreciationAndAmortization / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 2,408 us-gaap_DepreciationAndAmortization / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 2,461 us-gaap_DepreciationAndAmortization / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 2,028 us-gaap_DepreciationAndAmortization / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration