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22. Segment information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue |  |  |
Trading and manufacturing | $ 13,721 | $ 12,256 | $ 11,647
Engineering | 8,757 | 6,046 | 7,175
Revenue | 22,478 | 18,302 | 18,822
Operating (loss) |  |  |
Trading and manufacturing | (346) | (187) | (214)
Engineering | (209) | (1,624) | (640)
Unallocated corporate expenses | (115) | (147) | (117)
Operating expenses | (670) | (1,958) | (971)
Depreciation: |  |  |
Trading and manufacturing | 43 | 46 | 67
Engineering | 12 | 10 | 21
Depreciation | 55 | 56 | 88
Capital Expenditures, Gross |  |  |
Trading and manufacturing | 12 | 11 | 2
Engineering | 48 | 10 | 8
Total | 60 | 21 | $ 10
Assets |  |  |
Trading and manufacturing | 5,463 | 5,050 |
Engineering | 17,641 | 16,220 |
Total assets | 23,104 | 21,270 |
Liabilities |  |  |
Trading and manufacturing | 3,208 | 2,468 |
Engineering | 3,278 | 2,346 |
Total | $ 6,486 | $ 4,814 |

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