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D - INVESTMENT IN AFFILIATES (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Investment and advances | $ 7,979,000 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue | $ 8,022,000 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue |
Income from equity investees | 104,000 us-gaap_IncomeLossFromEquityMethodInvestments | (65,000)us-gaap_IncomeLossFromEquityMethodInvestments | 806,000 us-gaap_IncomeLossFromEquityMethodInvestments
Distributions | 186,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 1,218,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 97,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions
Siebert, Brandford, Shank Financial LLC and Subsidiary |  |  |
Income from equity investees | 84,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = SIEB_SbsFinancialMember |  |
Distributions | 13,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = SIEB_SbsFinancialMember |  |
SBSFPC |  |  |
Investment and advances |  | 190,000 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = SIEB_SbsfpcMember |
Income from equity investees | (17,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = SIEB_SbsfpcMember | (159,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = SIEB_SbsfpcMember | 32,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = SIEB_SbsfpcMember
Distributions | 173,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = SIEB_SbsfpcMember | 6,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = SIEB_SbsfpcMember | 2,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = SIEB_SbsfpcMember
SBS |  |  |
Investment and advances | 7,979,000 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = SIEB_SbsMember | 7,832,000 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = SIEB_SbsMember |
Income from equity investees |  | 94,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = SIEB_SbsMember | 774,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = SIEB_SbsMember
Distributions |  | $ 1,212,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = SIEB_SbsMember | $ 95,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = SIEB_SbsMember

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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition Value of the investment at close of period. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column E -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611322-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph 2 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph 3 -Article 12 + Details
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