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