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Income taxes (Details 2)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Tax losses | $ $ 858   $ 975  
Temporary differences | $ (19)   (17)  
Less: valuation allowances | $ (752)   (834)  
Net deferred tax assets | $ $ 87   $ 124  
ZHEJIANG TIANLAN        
Allowance for doubtful debts | ¥   ¥ 7,464   ¥ 13,201
Impairment losses on assets | ¥   5,025   0
Tax losses | ¥   1,481   1,037
Net deferred tax assets | ¥   ¥ 13,970   ¥ 14,238