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1. Organisation and principal activities (Details) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Euro Tech (Far East) Limited |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_EuroTechFarEastLimitedMember |
Euro Tech (China) Limited |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_EuroTechChinaLimitedMember |
ChinaH2O.com Limited |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ChinaH2OLimitedMember |
Euro Tech Trading (Shanghai) Limited |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_EuroTechTradingLimitedMember |
Shanghai Euro Tech Limited |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ShanghaiEuroTechLimitedMember |
Shanghai Euro Tech Environmental Engineering Company Limited |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ShanghaiEuroTechEnvironmentalEngineeringCompanyLimitedMember |
Chongqing Euro Tech Rizhi Technology Co., Ltd |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ChongqingEuroTechRizhiMember |
Rizhi Euro Tech Instrument (Shaanxi) Co., Ltd |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_RizhiEuroTechInstrumentMember |
Guangzhou Euro Tech Environmental Equipment Co., Ltd |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_GuangzhouEuroTechEnvironmentalMember |
Yixing Pact Environmental Technology Co., Ltd |  |
Percentage of equity ownership | 58.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_YixingPactEnvironmentalMember |
Pact Asia Pacific Limited |  |
Percentage of equity ownership | 58.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_PactAsiaPacificLimitedMember |
Zhejiang Tianlan Environmental Protection Technology Co. Ltd. |  |
Percentage of equity ownership | 20.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ZhejiangTianlanEnvironmentalProtectionTechnologyMember |
Zhejaing Jia Huan Electronic Co. Ltd |  |
Percentage of equity ownership | 20.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ZhejaingJiaMember |
Hangzhou Tianlan Environmental Engineering and Design Company Limited | ZHEJIANG TIANLAN |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_SubsidiarySaleOfStockAxis = CLWT_HangzhouTianlanEnvironmentalEngineeringMember | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_SubsidiarySaleOfStockAxis = CLWT_HangzhouTianlanEnvironmentalEngineeringMember
Hangzhou Tianlan Environmental Protection Equipments Company Limited | ZHEJIANG TIANLAN |  |
Percentage of equity ownership | 51.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_SubsidiarySaleOfStockAxis = CLWT_HangzhouTianlanEnvironmentalProtectionMember | 51.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_SubsidiarySaleOfStockAxis = CLWT_HangzhouTianlanEnvironmentalProtectionMember
Shihezi Tianlan Environmental Protection Technology Company Limited | ZHEJIANG TIANLAN |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ShiheziTianlanEnvironmentalMember | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ShiheziTianlanEnvironmentalMember
Da Tong Tianlan Environmental Protection Technology Service | ZHEJIANG TIANLAN |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_SubsidiarySaleOfStockAxis = CLWT_DaTongTianlanMember |
Jinhua Jiahuan Puzhau | ZHEJIANG JIAHUAN |  |
Percentage of equity ownership | 80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member / us-gaap_SubsidiarySaleOfStockAxis = CLWT_JinhuaJiahuanPuzhauMember | 80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member / us-gaap_SubsidiarySaleOfStockAxis = CLWT_JinhuaJiahuanPuzhauMember
Zhejiang Jiahuan Xinyu Environmental | ZHEJIANG JIAHUAN |  |
Percentage of equity ownership | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ZhejiangJiahuanXinyEnvironmentalMember | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member / us-gaap_SubsidiarySaleOfStockAxis = CLWT_ZhejiangJiahuanXinyEnvironmentalMember

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