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4. Income taxes (Details 1)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2013
USD ($)
Income before income taxes | $   $ (1,904)   $ (879)   $ (157)
Computed tax using respective companies’ statutory tax rates ¥ (177)   ¥ (194)   ¥ (49)  
Change in valuation allowances 455   93   124  
Under(over) -provision for income tax in prior years (69)   0   0  
Non deductible expenses (256)   119   (2)  
Total provision for income tax at effective tax rate (47)   18   73  
ZHEJIANG JIAHUAN            
Income before income taxes 5,797   5,194   2,327  
Computed tax using respective companies’ statutory tax rates 1,119   1,299   582  
Under(over) -provision for income tax in prior years 189   (278)   0  
Tax effect on revenue not subject to tax (447)   (537)   (20,983)  
Non deductible expenses 0   0   20,455  
Others 0   0   (35)  
Total provision for income tax at effective tax rate 861   484   19  
ZHEJIANG TIANLAN            
Income before income taxes 24,927   14,776   7,961  
Computed tax using respective companies’ statutory tax rates 3,767   2,216   1,194  
Under(over) -provision for income tax in prior years 0   (2,418)   (123)  
Temporary differences (177)   1,575   (445)  
Tax effect on revenue not subject to tax (1,068)   (695)   (242)  
Non deductible expenses 596   90   2,279  
Tax effect of unused tax losses not recognized 56   0   0  
Total provision for income tax at effective tax rate ¥ 3,174   ¥ 768   ¥ 2,663