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10. Interests in affiliates (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Balance Sheet:
Current assets	$ 11,136us-gaap_AssetsCurrent	$ 11,831us-gaap_AssetsCurrent
Total assets	23,686us-gaap_Assets	23,878us-gaap_Assets
Total liabilities	5,869us-gaap_Liabilities	6,001us-gaap_Liabilities
Total shareholders’ equity	16,030us-gaap_StockholdersEquity	15,872us-gaap_StockholdersEquity
Operating results:
Operating profits	(971)us-gaap_OperatingIncomeLoss	(255)us-gaap_OperatingIncomeLoss	(59)us-gaap_OperatingIncomeLoss
Net (loss)/profits	164us-gaap_NetIncomeLoss	(18)us-gaap_NetIncomeLoss	(429)us-gaap_NetIncomeLoss
Tianlan
Balance Sheet:
Current assets	63,750us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = CLWT_TianlanMember	55,742us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = CLWT_TianlanMember
Non-current assets	17,659us-gaap_AssetsNoncurrent / us-gaap_StatementScenarioAxis = CLWT_TianlanMember	9,733us-gaap_AssetsNoncurrent / us-gaap_StatementScenarioAxis = CLWT_TianlanMember
Total assets	81,409us-gaap_Assets / us-gaap_StatementScenarioAxis = CLWT_TianlanMember	65,475us-gaap_Assets / us-gaap_StatementScenarioAxis = CLWT_TianlanMember
Total liabilities	(54,543)us-gaap_Liabilities / us-gaap_StatementScenarioAxis = CLWT_TianlanMember	(40,672)us-gaap_Liabilities / us-gaap_StatementScenarioAxis = CLWT_TianlanMember
Total shareholders’ equity	26,866us-gaap_StockholdersEquity / us-gaap_StatementScenarioAxis = CLWT_TianlanMember	24,803us-gaap_StockholdersEquity / us-gaap_StatementScenarioAxis = CLWT_TianlanMember
Operating results:
Net sales	76,723us-gaap_SalesRevenueNet / us-gaap_StatementScenarioAxis = CLWT_TianlanMember	61,997us-gaap_SalesRevenueNet / us-gaap_StatementScenarioAxis = CLWT_TianlanMember
Operating profits	4,362us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = CLWT_TianlanMember	833us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = CLWT_TianlanMember
Net (loss)/profits	3,700us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = CLWT_TianlanMember	1,248us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = CLWT_TianlanMember
Jia Huan
Balance Sheet:
Current assets	21,264us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember	20,556us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember
Non-current assets	5,288us-gaap_AssetsNoncurrent / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember	5,635us-gaap_AssetsNoncurrent / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember
Total assets	26,552us-gaap_Assets / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember	26,191us-gaap_Assets / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember
Total liabilities	(12,675)us-gaap_Liabilities / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember	(12,623)us-gaap_Liabilities / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember
Total shareholders’ equity	13,877us-gaap_StockholdersEquity / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember	13,568us-gaap_StockholdersEquity / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember
Operating results:
Net sales	16,162us-gaap_SalesRevenueNet / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember	14,672us-gaap_SalesRevenueNet / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember
Operating profits	1,024us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember	545us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember
Net (loss)/profits	$ 762us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember	$ 377us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = CLWT_JiaHuanMember

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