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Other (losses) / income, net (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Exchange (loss), net | $ $ (46)   $ (75)   $ (75)  
Rental income | $ 32   80   84  
Total | $ $ (14)   $ 5   $ 9  
ZHEJIANG TIANLAN            
(Loss) on disposal of property, plant and equipment   ¥ 0   ¥ (15)   ¥ 0
Subsidy income   2,262   3,360   2,617
Sales of scrapped materials   37   3   6
Investment income   (405)   412   0
Others   (7)   (304)   150
Other income, net   1,887   3,456   2,773
ZHEJIANG JIAHUAN            
Government grant   4,350   3,115   200
Rental income [1]   1,316   1,271   901
Interest income   4   54   44
Sundry income   176   152   263
Other income, net   ¥ 5,846   ¥ 4,592   ¥ 1,408
[1] Rental income under operating leases is recognized on a straight-line basis over the term of the relevant lease.