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Organization and business (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Euro Tech (Far East) Limited    
Percentage of equity ownership 100.00% 100.00%
Euro Tech (China) Limited    
Percentage of equity ownership 100.00% [1] 100.00%
Euro Tech Trading (Shanghai) Limited    
Percentage of equity ownership 100.00% 100.00%
Shanghai Euro Tech Limited    
Percentage of equity ownership 100.00% 100.00%
Shanghai Euro Tech Environmental Engineering Company Limited    
Percentage of equity ownership 100.00% 100.00%
Chongqing Euro Tech Rizhi Technology Co., Ltd    
Percentage of equity ownership [2] 100.00%
Rizhi Euro Tech Instrument (Shaanxi) Co., Ltd    
Percentage of equity ownership [3] 100.00%
Guangzhou Euro Tech Environmental Equipment Co., Ltd    
Percentage of equity ownership [4] 100.00%
Yixing Pact Environmental Technology Co., Ltd    
Percentage of equity ownership 58.00% 58.00%
Pact Asia Pacific Limited    
Percentage of equity ownership 58.00% 58.00%
Zhejiang Tianlan Environmental Protection Technology Co. Ltd.    
Percentage of equity ownership [5] 19.40% 19.40%
Hangzhou Tianlan Environmental Protection Equipments Company Limited | ZHEJIANG TIANLAN    
Percentage of equity ownership 51.00% 51.00%
Hangzhou Tianlan Pure Environmental Protection Technology Company Limited | ZHEJIANG TIANLAN    
Percentage of equity ownership 40.80% 51.00%
Hangzhou Tiancan Environmental Technology Company Limited | ZHEJIANG TIANLAN    
Percentage of equity ownership 100.00% 100.00%
[1] This company was deregistered on April 3, 2020.
[2] This company was dissolved on December 12, 2019.
[3] This company was dissolved on December 24, 2019.
[4] This company was dissolved on March 18, 2019.
[5] The Group's interest in Blue Sky has been counted for as an affiliate using the equity method as the Group has representation on both the Board and Executive Committee of Blue Sky, and the ability to participate in the decision-making process and exercise significant influence.