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Segment information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue |  |  |
Trading and manufacturing | $ 11,001 | $ 13,721 | $ 12,256
Engineering | 6,349 | 8,757 | 6,046
Revenue | 17,350 | 22,478 | 18,302
Operating loss |  |  |
Trading and manufacturing | (153) | (346) | (187)
Engineering | (306) | (209) | (1,624)
Unallocated corporate expenses | (115) | (115) | (147)
Operating expenses | (574) | (670) | (1,958)
Depreciation: |  |  |
Trading and manufacturing | 41 | 43 | 46
Engineering | 20 | 12 | 10
Depreciation | 61 | 55 | 56
Capital Expenditures, Gross |  |  |
Trading and manufacturing | 13 | 12 | 11
Engineering | 5 | 48 | 10
Total | 18 | 60 | $ 21
Assets |  |  |
Trading and manufacturing | 5,049 | 5,463 |
Engineering | 18,688 | 17,641 |
Total assets | 23,737 | 23,104 |
Liabilities |  |  |
Trading and manufacturing | 2,806 | 3,208 |
Engineering | 3,824 | 3,278 |
Total | $ 6,630 | $ 6,486 |

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