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1. Organisation and principal activities (Details)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Euro Tech (Far East) Limited
    
Percentage of equity ownership 100.00%  
Euro Tech (China) Limited
    
Percentage of equity ownership 100.00%  
ChinaH2O.com Limited***
    
Percentage of equity ownership 100.00% [1]  
Euro Tech Trading (Shanghai) Limited
    
Percentage of equity ownership 100.00%  
Shanghai Euro Tech Limited
    
Percentage of equity ownership 100.00%  
Shanghai Euro Tech Environmental Engineering Company Limited
    
Percentage of equity ownership 100.00%  
Chongqing Euro Tech Rizhi Technology Co., Ltd
    
Percentage of equity ownership 100.00%  
Rizhi Euro Tech Instrument (Shaanxi) Co., Ltd
    
Percentage of equity ownership 100.00%  
Guangzhou Euro Tech Environmental Equipment Co., Ltd
    
Percentage of equity ownership 100.00%  
Yixing Pact Environmental Technology Co., Ltd
    
Percentage of equity ownership 58.00% [2]  
Pact Asia Pacific Limited
    
Percentage of equity ownership 58.00% [2],[3]  
Zhejiang Tianlan Environmental Protection Technology Co. Ltd.
    
Percentage of equity ownership 20.00%  
Zhejaing Jia Huan Electronic Co. Ltd
    
Percentage of equity ownership 20.00%  
Hangzhou Tianlan Environmental Engineering and Design Company Limited | ZHEJIANG
    
Percentage of equity ownership 100.00% 100.00%
Hangzhou Tianlan Environmental Protection Equipments Company Limited | ZHEJIANG
    
Percentage of equity ownership 51.00% 51.00%
Shihezi Tianlan Environmental Protection Technology Company Limited | ZHEJIANG
    
Percentage of equity ownership 100.00% 0.00%
[1] The subsidiary was deregistered on February 17, 2012.
[2] In the year 2011, the Company additionally acquired 5% equity interest of these two companies.
[3] The subsidiary of Pact Asia Pacific Limited, Pact Environmental Equipment Co., Ltd was deregistered on January 11, 2013.