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Organisation and principal activities (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Euro Tech (Far East) Limited |  |  |  |
Percentage of equity ownership |  | 100.00% |  | 100.00%
Euro Tech (China) Limited |  |  |  |
Percentage of equity ownership |  | 100.00% |  | 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 |  | 100.00% |  | 100.00%
Rizhi Euro Tech Instrument (Shaanxi) Co., Ltd |  |  |  |
Percentage of equity ownership |  | 100.00% |  | 100.00%
Guangzhou Euro Tech Environmental Equipment Co., Ltd |  |  |  |
Percentage of equity ownership |  | 100.00% |  | 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 |  | 19.40% | [1] | 19.70%
Zhejaing Jia Huan Electronic Co. Ltd |  |  |  |
Percentage of equity ownership |  | 20.00% |  | 20.00%
Zhejiang Tianlan Environmental Engineering and Design Company Limited | ZHEJIANG TIANLAN |  |  |  |
Percentage of equity ownership |  | 100.00% |  | 100.00%
Hangzhou Tianlan Environmental Protection Equipments Company Limited | ZHEJIANG TIANLAN |  |  |  |
Percentage of equity ownership |  | 51.00% |  | 51.00%
Shihezi Tianlan Environmental Protection Technology Company Limited | ZHEJIANG TIANLAN |  |  |  |
Percentage of equity ownership |  | 100.00% |  | 100.00%
Hangzhou Tianlian Environmental Testing Technology Company Limited | ZHEJIANG TIANLAN |  |  |  |
Percentage of equity ownership | [2] | 80.00% |  | 80.00%
Jinhua Jiahuan Puzhau | ZHEJIANG JIAHUAN |  |  |  |
Percentage of equity ownership | [3] | 0.00% |  | 0.00%
Zhejiang Jiahuan Xinyu Environmental | ZHEJIANG JIAHUAN |  |  |  |
Percentage of equity ownership |  | 100.00% |  | 100.00%
[1] | The Group interest in Blue Sky has been counted for as an affiliate using the equity method as the Group has representation in both the Board and Executive Committee of Blue Sky, and the ability to participate in the decision-making process.
[2] | The Company was incorporated on October 28, 2015. On April 17, 2016, the board of director approved the sales of 1,000,000 ordinary shares at a price RMB 1.00 per shares, which in the aggregate amount the gross proceeds of RMB 1,000,000 to the third parties.
[3] | The Company has been deregistered on September 1, 2015.

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