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4. Income taxes (Details 1)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2014
USD ($)
Income before income taxes | $   $ (640)   $ (1,904)   $ (879)
Computed tax using respective companies’ statutory tax rates | $   (136)   (177)   (194)
Change in valuation allowances | $   350   455   93
Under (Over) - provision for income tax in prior years | $   0   (69)   0
Non deductible expenses | $   14   (256)   119
Total provision / (credit) for income tax at effective tax rate | $   $ 228   $ (47)   $ 18
ZHEJIANG JIAHUAN            
Income before income taxes ¥ 11,849   ¥ 5,797   ¥ 5,194  
Computed tax using respective companies’ statutory tax rates 2,326   1,119   1,299  
Under (Over) - provision for income tax in prior years (9)   189   (278)  
Tax effect on revenue not subject to tax (930)   (447)   (537)  
Non deductible expenses     0   0  
Others     0   0  
Total provision / (credit) for income tax at effective tax rate 1,387   861   484  
ZHEJIANG TIANLAN            
Income before income taxes 27,603   24,927   14,776  
Computed tax using respective companies’ statutory tax rates 4,078   3,767   2,216  
Under (Over) - provision for income tax in prior years 57   0   (2,418)  
Permanent difference (82)   0   0  
Temporary differences (1,337)   (177)   1,575  
Tax effect on revenue not subject to tax (901)   (1,068)   (695)  
Non deductible expenses 2,732   596   90  
Tax effect of unused tax losses not recognized 414   56   0  
Total provision / (credit) for income tax at effective tax rate ¥ 4,961   ¥ 3,174   ¥ 768