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10. Interests in affiliates (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance Sheet:      
Total assets $ 24,947 $ 23,864  
Total liabilities 7,191 5,955  
Operating results:      
Operating profits (59) (1,674) (1,378)
Tianlan
      
Balance Sheet:      
Current assets 57,431 49,064  
Non-current assets 9,605 10,322  
Total assets 67,036 59,386  
Total liabilities (42,889) (35,154)  
Total shareholders’ equity 24,147 24,232  
Operating results:      
Net sales 44,543 45,966  
Operating profits 616 6,899  
Net (loss)/profits (196) 6,407  
Jia Huan
      
Balance Sheet:      
Current assets 17,371 16,645  
Non-current assets 5,650 5,402  
Total assets 23,021 22,047  
Total liabilities (9,893) (9,295)  
Total shareholders’ equity 13,128 12,752  
Operating results:      
Net sales 12,631 8,151  
Operating profits 74 (903)  
Net (loss)/profits $ 243 $ (749)