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4. Income taxes (Details 1)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2013
ZHEJIANG TIANLAN
CNY
Dec. 31, 2012
ZHEJIANG TIANLAN
CNY
Dec. 31, 2011
ZHEJIANG TIANLAN
CNY
Dec. 31, 2013
ZHEJIANG JIAHUAN
CNY
Dec. 31, 2012
ZHEJIANG JIAHUAN
CNY
Dec. 31, 2011
ZHEJIANG JIAHUAN
CNY
Income before income taxes $ (157) $ 13 $ (1,204) 7,961 933 47,309 2,327 1,535 (5,044)
Computed tax using respective companies’ statutory tax rates (49) 31 (263) 1,194 140 7,096 582 384 (1,261)
Change in valuation allowances 124 166 33            
Under(over) -provision for income tax in prior years 0 0 (10) (122) 1,358 512      
Temporary differences       (445)            
Tax effect on revenue not subject to tax       (242) (56) (652) (20,983) (20,291) (1,964)
Non deductible expenses (2) (55) 177 2,279 992 963 20,455 19,907 2,078
Others             (35)    867
Total provision for income tax at effective tax rate $ 73 $ 142 $ (63) 2,664 2,434 7,919 19    (280)