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Interests in affiliates (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Balance Sheet: |  |  |
Current assets | $ 12,010 | $ 13,533 |
Non-current assets | 10,203 | 9,532 |
Total assets | 22,213 | 23,065 |
Total liabilities | (6,876) | (7,520) |
Total shareholders' equity | 14,459 | 14,589 |
Operating results: |  |  |
Operating income | (440) | (1,059) | $ (574)
Net income | (146) | 88 | $ 473
Blue Sky |  |  |
Balance Sheet: |  |  |
Current assets | 41,614 | 46,925 |
Non-current assets | 15,666 | 19,450 |
Total assets | 57,280 | 66,375 |
Total liabilities | (31,108) | (40,330) |
Total shareholders' equity | 26,172 | 26,045 |
Operating results: |  |  |
Net sales | 40,348 | 50,165 |
Operating income | 677 | (5,194) |
Net income | $ 704 | $ (4,048) |

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