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4. Income taxes (Details 2)
In Thousands, unless otherwise specified
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
ZHEJIANG
CNY
Dec. 31, 2011
ZHEJIANG
CNY
The components of deferred tax assets are as follows:        
Tax losses $ 977 $ 811 0 348
Temporary differences (24) 1    
Allowance for doubtful debts     2,513 2,949
Less: Valuation allowances (691) (525)    
Net deferred tax assets $ 262 $ 287 2,513 3,297