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7A. Long term investments (Details) (ZHEJIANG JIAHUAN, CNY) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
ZHEJIANG JIAHUAN |  |
Long term investment: Unlisted investment Amortized cost | 69 us-gaap_LongTermInvestments / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 69 us-gaap_LongTermInvestments / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member
Gains Gross unrealized | 0 us-gaap_AvailableForSaleEquitySecuritiesGrossUnrealizedGain / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 0 us-gaap_AvailableForSaleEquitySecuritiesGrossUnrealizedGain / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member
Losses Gross unrealized | 0 us-gaap_AvailableForSaleEquitySecuritiesGrossUnrealizedLoss / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 0 us-gaap_AvailableForSaleEquitySecuritiesGrossUnrealizedLoss / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member
Long term investment: Unlisted investment Fair Value | 69 us-gaap_LongTermInvestments / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 69 us-gaap_LongTermInvestments / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member

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- Definition Amount of unrealized gain before deducting unrealized loss on investments in equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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