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Interests in affiliates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance Sheet:      
Current assets $ 9,616 $ 9,587  
Non-current assets 14,121 13,517  
Total assets 23,737 23,104  
Total liabilities (6,630) (6,486)  
Total shareholders’ equity 15,969 15,435  
Operating results:      
Operating income (574) (670) $ (1,958)
Net income 473 231 $ (616)
Blue Sky      
Balance Sheet:      
Current assets 56,911 46,297  
Non-current assets 26,544 25,847  
Total assets 83,455 72,144  
Total liabilities (36,948) (45,372)  
Total shareholders’ equity 46,507 26,772  
Operating results:      
Net sales 62,234 43,226  
Operating income 4,439 3,841  
Net income 3,863 3,473  
Jia Huan      
Balance Sheet:      
Current assets 21,374 22,021  
Non-current assets 4,570 2,079  
Total assets 25,944 26,100  
Total liabilities (10,215) (11,694)  
Total shareholders’ equity 15,729 14,406  
Operating results:      
Net sales 16,301 16,684  
Operating income 32 1,586  
Net income $ 597 $ 1,564