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B - BUSINESS ACQUISITION (Details) (USD $)
3 Months Ended 12 Months Ended
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 $ 4,975,000us-gaap_Revenues $ 3,454,000us-gaap_Revenues $ 3,705,000us-gaap_Revenues $ 3,718,000us-gaap_Revenues $ 4,191,000us-gaap_Revenues $ 3,666,000us-gaap_Revenues $ 4,278,000us-gaap_Revenues $ 4,266,000us-gaap_Revenues $ 15,815,000us-gaap_Revenues $ 16,401,000us-gaap_Revenues $ 20,983,000us-gaap_Revenues
Net Income 948,000us-gaap_NetIncomeLoss (1,456,000)us-gaap_NetIncomeLoss (6,077,000)us-gaap_NetIncomeLoss 28,000us-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                   24,965,000us-gaap_Revenues
/ dei_LegalEntityAxis
= SIEB_SbsMember
28,246,000us-gaap_Revenues
/ dei_LegalEntityAxis
= SIEB_SbsMember
Net Income                   193,000us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= SIEB_SbsMember
1,579,000us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= SIEB_SbsMember
Pro Forma [Member] | SBS                      
Revenue                 27,729,000us-gaap_Revenues
/ dei_LegalEntityAxis
= SIEB_SbsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
   
Net Income                 $ 672,000us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= SIEB_SbsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember