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20. Commitments and contingencies (Details Narrative) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2014 USD ($)
Rental expenses | $ |  | $ 297 |  | $ 297 |  | $ 293
ZHEJIANG TIANLAN |  |  |  |  |  |
Rental expenses | ¥ 0 |  | ¥ 0 |  | ¥ 0 |
ZHEJIANG JIAHUAN |  |  |  |  |  |
Rental expenses | ¥ 0 |  | ¥ 0 |  | ¥ 0 |

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=CLWT_Subsidiary2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |