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Income taxes (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 (¥)
Profit/(loss before) income taxes/(benefit): The PRC and Hong Kong | $ $ (564)   $ (640)   $ (1,904)  
The provision / (credit) for income taxes consist of:            
Current tax expenses: The PRC and Hong Kong | $ 0   212   (72)  
Total current provision / (credit) | $ 0   212   (72)  
Deferred tax expenses: The PRC and Hong Kong | $ 28   16   25  
Total deferred provision | $ 28   16   25  
Income taxes (expense) / credit | $ $ 28   $ 228   $ (47)  
ZHEJIANG TIANLAN            
Profit/(loss before) income taxes/(benefit): The PRC and Hong Kong   ¥ 30,047   ¥ 27,603   ¥ 24,927
The provision / (credit) for income taxes consist of:            
Current PRC EIT Domestic   4,237   6,298   3,351
Total current provision / (credit)   4,237   6,298   3,351
Deferred tax benefit   (405)   (1,337)   (177)
Total deferred provision   (405)   (1,337)   (177)
Income taxes (expense) / credit   3,832   4,961   3,174
ZHEJIANG JIAHUAN            
Profit/(loss before) income taxes/(benefit): The PRC and Hong Kong   4,314   11,848   5,797
The provision / (credit) for income taxes consist of:            
Income taxes (expense) / credit   ¥ 263   ¥ 1,387   ¥ 861