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10. Interests in affiliates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Balance Sheet:      
Current assets $ 11,136 $ 11,831  
Total assets 23,399 23,878  
Total liabilities 5,869 6,001  
Total shareholders’ equity 15,743 15,872  
Operating results:      
Operating profits (971) (255) $ (59)
Net (loss)/profits (123) (18) $ (429)
Tianlan      
Balance Sheet:      
Current assets 61,708 55,742  
Non-current assets 28,287 9,733  
Total assets 89,995 65,475  
Total liabilities (64,572) (40,672)  
Total shareholders’ equity 25,423 24,803  
Operating results:      
Net sales 64,131 61,997  
Operating profits 2,637 833  
Net (loss)/profits 2,266 1,248  
Jia Huan      
Balance Sheet:      
Current assets 21,264 20,556  
Non-current assets 5,288 5,635  
Total assets 26,552 26,191  
Total liabilities (12,675) (12,623)  
Total shareholders’ equity 13,877 13,568  
Operating results:      
Net sales 16,162 14,672  
Operating profits 1,024 545  
Net (loss)/profits $ 762 $ 377