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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 |

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