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2. Summary of significant accounting policies (Details Narrative 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
Research and Development Costs | $ 631 us-gaap_ResearchAndDevelopmentExpense | $ 427 us-gaap_ResearchAndDevelopmentExpense | $ 930 us-gaap_ResearchAndDevelopmentExpense | 21,796 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 15,018 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 14,890 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 4,981 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 3,893 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member
Advertising and promotional expenses | $ 44 us-gaap_MarketingAndAdvertisingExpense | $ 12 us-gaap_MarketingAndAdvertisingExpense | $ 21 us-gaap_MarketingAndAdvertisingExpense | 11 us-gaap_MarketingAndAdvertisingExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 25 us-gaap_MarketingAndAdvertisingExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 26 us-gaap_MarketingAndAdvertisingExpense / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember |  |

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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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