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Income taxes (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
The provision / (credit) for income taxes consist of:            
Current taxes (expense) / credit: Hong Kong profits tax and the PRC EIT | $ $ (4)   $ 0   $ 346  
Income tax (expense) / credit | $ (4)   0   346  
Deferred tax expenses: Hong Kong and the PRC | $ (92)   (37)   (34)  
Total deferred tax expense / (credit) | $ (92)   (37)   (34)  
Total (expense) / credit | $ $ (96)   $ (37)   $ 312  
ZHEJIANG TIANLAN            
The provision / (credit) for income taxes consist of:            
Current PRC EIT | ¥   ¥ 757   ¥ 28   ¥ 2
Income tax (expense) / credit | ¥   757   28   2
Deferred tax expense / (credit) | ¥   1,101   268   (7,969)
Total deferred tax expense / (credit) | ¥   1,101   268   (7,969)
Total (expense) / credit | ¥   ¥ (1,858)   ¥ (296)   ¥ 7,967