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v2.4.1.9

B - BUSINESS ACQUISITION (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue | $ 4,975,000 us-gaap_Revenues | $ 3,454,000 us-gaap_Revenues | $ 3,705,000 us-gaap_Revenues | $ 3,718,000 us-gaap_Revenues | $ 4,191,000 us-gaap_Revenues | $ 3,666,000 us-gaap_Revenues | $ 4,278,000 us-gaap_Revenues | $ 4,266,000 us-gaap_Revenues | $ 15,815,000 us-gaap_Revenues | $ 16,401,000 us-gaap_Revenues | $ 20,983,000 us-gaap_Revenues
Net Income | 948,000 us-gaap_NetIncomeLoss | (1,456,000)us-gaap_NetIncomeLoss | (6,077,000)us-gaap_NetIncomeLoss | 28,000 us-gaap_NetIncomeLoss | (1,546,000)us-gaap_NetIncomeLoss | (1,644,000)us-gaap_NetIncomeLoss | (1,353,000)us-gaap_NetIncomeLoss | (1,369,000)us-gaap_NetIncomeLoss | (6,557,000)us-gaap_NetIncomeLoss | (5,912,000)us-gaap_NetIncomeLoss | (171,000)us-gaap_NetIncomeLoss
SBS |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 24,965,000 us-gaap_Revenues / dei_LegalEntityAxis = SIEB_SbsMember | 28,246,000 us-gaap_Revenues / dei_LegalEntityAxis = SIEB_SbsMember
Net Income |  |  |  |  |  |  |  |  |  | 193,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = SIEB_SbsMember | 1,579,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = SIEB_SbsMember
Pro Forma [Member] | SBS |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 27,729,000 us-gaap_Revenues / dei_LegalEntityAxis = SIEB_SbsMember / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember |  |
Net Income |  |  |  |  |  |  |  |  | $ 672,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = SIEB_SbsMember / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember |  |

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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