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1. Organisation and principal activities (Details) | 12 Months Ended
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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.

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- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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