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8. Investment In and Advances to Affiliates (Details Narrative) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income (loss) $ (1,534,000)us-gaap_NetIncomeLoss $ 28,000us-gaap_NetIncomeLoss
Siebert Brandford Shank Co LLC [Member]    
General and administrative services 25,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= SIEB_SiebertBrandfordShankAndCoLlcMember
 
Net income (loss) (688,000)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= SIEB_SiebertBrandfordShankAndCoLlcMember
 
Distribution from equity investees 16,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= SIEB_SiebertBrandfordShankAndCoLlcMember
 
Undistributed earnings $ 6,700,000us-gaap_UndistributedEarnings
/ dei_LegalEntityAxis
= SIEB_SiebertBrandfordShankAndCoLlcMember