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22. Segment information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue |  |  |
Trading and manufacturing | $ 11,647 us-gaap_RevenueOtherManufacturedProducts | $ 10,986 us-gaap_RevenueOtherManufacturedProducts | $ 10,866 us-gaap_RevenueOtherManufacturedProducts
Engineering | 7,175 us-gaap_TechnologyServicesRevenue | 7,616 us-gaap_TechnologyServicesRevenue | 10,779 us-gaap_TechnologyServicesRevenue
Revenue | 18,822 us-gaap_Revenues | 18,602 us-gaap_Revenues | 21,645 us-gaap_Revenues
Operating (loss)/income |  |  |
Trading and manufacturing | (214)CLWT_ExpenseTradingAndManufacturing | (241)CLWT_ExpenseTradingAndManufacturing | (301)CLWT_ExpenseTradingAndManufacturing
Engineering | (640)us-gaap_TechnologyServicesCosts | 106 us-gaap_TechnologyServicesCosts | 401 us-gaap_TechnologyServicesCosts
Unallocated corporate expenses | (117)us-gaap_SellingGeneralAndAdministrativeExpense | (120)us-gaap_SellingGeneralAndAdministrativeExpense | (159)us-gaap_SellingGeneralAndAdministrativeExpense
Operating expenses | (971)us-gaap_OperatingIncomeLoss | (255)us-gaap_OperatingIncomeLoss | (59)us-gaap_OperatingIncomeLoss
Depreciation: |  |  |
Trading and manufacturing | 67 us-gaap_CostOfGoodsSoldDepreciation | 74 us-gaap_CostOfGoodsSoldDepreciation | 88 us-gaap_CostOfGoodsSoldDepreciation
Engineering | 21 us-gaap_CostOfServicesDepreciationAndAmortization | 34 us-gaap_CostOfServicesDepreciationAndAmortization | 42 us-gaap_CostOfServicesDepreciationAndAmortization
Depreciation | 88 us-gaap_Depreciation | 108 us-gaap_Depreciation | 130 us-gaap_Depreciation
Capital Expenditures, Gross |  |  |
Trading and manufacturing | 2 CLWT_CapitalExpendiruresTradingAndManufacturing | 31 CLWT_CapitalExpendiruresTradingAndManufacturing | 12 CLWT_CapitalExpendiruresTradingAndManufacturing
Engineering | 8 CLWT_CapitalExpendiruresEngineering | 20 CLWT_CapitalExpendiruresEngineering | 29 CLWT_CapitalExpendiruresEngineering
Total | 10 CLWT_TotalCapitalExpendirures | 51 CLWT_TotalCapitalExpendirures | 41 CLWT_TotalCapitalExpendirures
Assets |  |  |
Trading and manufacturing | 5,664 CLWT_TradingAndManufacturingAssets | 5,067 CLWT_TradingAndManufacturingAssets |
Engineering | 18,022 CLWT_EngineeringAssets | 18,811 CLWT_EngineeringAssets |
Total assets | 23,686 us-gaap_Assets | 23,878 us-gaap_Assets |
Liabilities |  |  |
Trading and manufacturing | 2,929 CLWT_TradingAndManufacturingLiabilities | 1,334 CLWT_TradingAndManufacturingLiabilities |
Engineering | 2,940 CLWT_EngineeringLiabilities | 4,667 CLWT_EngineeringLiabilities |
Total | $ 5,869 us-gaap_Liabilities | $ 6,001 us-gaap_Liabilities |

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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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