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