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10A. Intangible assets, net (Details) (ZHEJIANG TIANLAN, CNY) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
ZHEJIANG TIANLAN |  |  |
Patents | 2,400 us-gaap_FiniteLivedPatentsGross / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 2,750 us-gaap_FiniteLivedPatentsGross / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |
Others | 165 us-gaap_OtherFiniteLivedIntangibleAssetsGross / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 165 us-gaap_OtherFiniteLivedIntangibleAssetsGross / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |
Gross | 2,565 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 2,915 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |
Less: Accumulated amortisation | (824)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | (665)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |
Net | 1,741 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 2,250 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |
Amortisation expense | 239 CLWT_AmortisationExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 395 CLWT_AmortisationExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 164 CLWT_AmortisationExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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
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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights. + 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
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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of intangible assets not otherwise specified in the taxonomy having a reasonably expected period of economic benefit. + 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
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