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10. Interests in affiliates (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Balance Sheet:      
Current assets $ 11,831 $ 12,897  
Total assets 23,878 24,947  
Total liabilities 6,001 7,191  
Total shareholders’ equity 15,872 15,837  
Operating results:      
Operating profits (255) (59) (1,674)
Net (loss)/profits (18) (429) 521
Tianlan
      
Balance Sheet:      
Current assets 55,742 57,431  
Non-current assets 9,733 9,605  
Total assets 65,475 67,036  
Total liabilities (40,672) (42,889)  
Total shareholders’ equity 24,803 24,147  
Operating results:      
Net sales 61,997 44,543  
Operating profits 833 (326)  
Net (loss)/profits 1,248 (196)  
Jia Huan
      
Balance Sheet:      
Current assets 20,556 17,371  
Non-current assets 5,635 5,650  
Total assets 26,191 23,021  
Total liabilities (12,623) (9,893)  
Total shareholders’ equity 13,568 13,128  
Operating results:      
Net sales 14,672 12,631  
Operating profits 545 428  
Net (loss)/profits $ 377 $ 243