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3. Other income, net (Details)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
ZHEJIANG
CNY
Dec. 31, 2011
ZHEJIANG
CNY
Dec. 31, 2010
ZHEJIANG
CNY
Exchange (loss)/gain, net $ (17) $ 26 $ (17)      
Rental income 65 56 26      
Subsidy income (note i)       7,170 [1] 4,483 [1] 5,954 [1]
Sales of scrapped materials       31 78 0
Others       140 600 120
Total $ 48 $ 82 $ 9 7,341 5,161 6,074
[1] (i) The Group recognises subsidy income for R&D projects when granted by institutions and are not probably to be returned or reimbursed.