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22. Segment information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue |  |  |
Trading and manufacturing | $ 10,866 | $ 11,437 | $ 13,745
Engineering | 10,779 | 8,776 | 8,560
Revenue | 21,645 | 20,213 | 22,305
Operating (loss)/income |  |  |
Trading and manufacturing | (301) | (720) | (1,590)
Engineering | 401 | (802) | 354
Unallocated corporate expenses | (159) | (152) | (142)
Operating expenses | (59) | (1,674) | (1,378)
Depreciation: |  |  |
Trading and manufacturing | 88 | 137 | 132
Engineering | 42 | 45 | 38
Depreciation | 130 | 182 | 170
Capital Expenditures, Gross |  |  |
Trading and manufacturing | 12 | 44 | 52
Engineering | 29 | 19 | 60
Total | 41 | 63 | 112
Assets |  |  |
Trading and manufacturing | 6,211 | 6,215 |
Engineering | 18,736 | 17,649 |
Total assets | 24,947 | 23,864 |
Liabilities |  |  |
Engineering | 4,576 | 3,640 |
Trading and manufacturing | 2,615 | 2,315 |
Total | $ 7,191 | $ 5,955 |

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- Definition Costs incurred in providing technology services. The services may include training, installation, engineering or consulting. Consulting services often include implementation support, software design or development, or the customization or modification of the licensed software. + 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 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 605 -Section 25 -Paragraph 76 -URI http://asc.fasb.org/extlink&oid=19772080&loc=d3e132428-111767 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 97-2 -Paragraph 63 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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