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22. Segment information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue |  |  |
Trading and manufacturing | $ 11,647 | $ 10,986 | $ 10,866
Engineering | 7,175 | 7,616 | 10,779
Revenue | 18,822 | 18,602 | 21,645
Operating (loss)/income |  |  |
Trading and manufacturing | (214) | (241) | (301)
Engineering | (640) | 106 | 401
Unallocated corporate expenses | (117) | (120) | (159)
Operating expenses | (971) | (255) | (59)
Depreciation: |  |  |
Trading and manufacturing | 67 | 74 | 88
Engineering | 21 | 34 | 42
Depreciation | 88 | 108 | 130
Capital Expenditures, Gross |  |  |
Trading and manufacturing | 2 | 31 | 12
Engineering | 8 | 20 | 29
Total | 10 | 51 | $ 41
Assets |  |  |
Trading and manufacturing | 5,664 | 5,067 |
Engineering | 17,735 | 18,811 |
Total assets | 23,399 | 23,878 |
Liabilities |  |  |
Trading and manufacturing | 2,929 | 1,334 |
Engineering | 2,940 | 4,667 |
Total | $ 5,869 | $ 6,001 |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51677171&loc=d3e3636-108311 + Details
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