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Other income / (losses), net (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 (¥)
Exchange gain / (loss), net | $ $ 101   $ (30)   $ 7  
Rental income | $ 59   82   51  
Government subsidies - Employment Support Scheme | $ 147 [1]   0   0  
Other income, net | $ 307   52   58  
Impairment loss on property, plant and equipment | $ $ 54   $ 10   $ 0  
ZHEJIANG TIANLAN            
Compensation income   ¥ 22,548   ¥ 0   ¥ 0
Gain on disposal of property, plant and equipment   0   39   0
Investment income   266   0   1,661
Others   4,535   280   1,363
Reversal of allowance for doubtful accounts   6,463   0   0
Subsidy income   5,834   5,957   5,537
Other income, net   39,646   6,276   8,561
Bad debts written off   0   5,383   13,946
Impairment loss on contract assets   1,399   0   0
Impairment loss on long-term investments   1,340   0   0
Impairment loss on property, plant and equipment   2,742   0   33,500
Investment loss   0   241   0
Other losses, net   ¥ 5,481   ¥ 5,624   ¥ 47,446
[1] The amount represents salaries and wage subsidies granted under Anti-Epidemic Fund by the Government of the Hong Kong Special Administrative Region for the use of paying wages of employees from June to November 2020.