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22. Segment information (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue | $ 18,822 us-gaap_Revenues | $ 18,602 us-gaap_Revenues | $ 21,645 us-gaap_Revenues
Geographical analysis of long-lived assets | 811 CLWT_GeographicalAnalysisOfLonglivedAssets | 889 CLWT_GeographicalAnalysisOfLonglivedAssets |
The PRC |  |  |
Revenue | 10,950 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_ThePRCMember | 12,392 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_ThePRCMember | 15,867 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_ThePRCMember
Geographical analysis of long-lived assets | 279 CLWT_GeographicalAnalysisOfLonglivedAssets / us-gaap_StatementBusinessSegmentsAxis = CLWT_ThePRCMember | 321 CLWT_GeographicalAnalysisOfLonglivedAssets / us-gaap_StatementBusinessSegmentsAxis = CLWT_ThePRCMember |
Hong Kong |  |  |
Revenue | 6,177 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_HongKongMember | 5,919 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_HongKongMember | 5,511 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_HongKongMember
Geographical analysis of long-lived assets | 532 CLWT_GeographicalAnalysisOfLonglivedAssets / us-gaap_StatementBusinessSegmentsAxis = CLWT_HongKongMember | 568 CLWT_GeographicalAnalysisOfLonglivedAssets / us-gaap_StatementBusinessSegmentsAxis = CLWT_HongKongMember |
Others |  |  |
Revenue | $ 1,695 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_OtherGeographicAreaMember | $ 291 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_OtherGeographicAreaMember | $ 267 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = CLWT_OtherGeographicAreaMember

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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