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Income taxes (Details)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Current taxes (expense )            
Current taxes (expense): Hong Kong profits tax and the PRC EIT | $ $ 0   $ (57,000)   $ (4,000)  
Income tax expense | $ 0   (57,000)   (4,000)  
Deferred tax credit / (expenses): Hong Kong and the PRC | $ (24,000)   147,000   (92,000)  
Total deferred tax credit / (expense) | $ (24,000)   147,000   (92,000)  
Total credit / (expense) | $ $ (24,000)   $ 90,000   $ (96,000)  
ZHEJIANG TIANLAN            
Current taxes (expense )            
Total deferred tax credit / (expense) | ¥   ¥ (361)   ¥ (666)   ¥ 1,101
Total credit / (expense) | ¥   (368)   (698)   1,858
Current tax (credit) / expense : PRC EIT | ¥   (7)   (32)   757
Income tax (credit) / expense | ¥   (7)   (32)   757
Deferred tax (credit) / expense | ¥   ¥ (361)   ¥ (666)   ¥ 1,101