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J - Commitments, Contingencies And Other (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Rent expense $ 788,000us-gaap_LeaseAndRentalExpense $ 1,046,000us-gaap_LeaseAndRentalExpense $ 907,000us-gaap_LeaseAndRentalExpense
Siebert, Brandford, Shank Financial LLC and Subsidiary      
Rent expense 1,186,967us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= SIEB_SbsFinancialMember
   
SBS      
Rent expense   $ 1,088,755us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= SIEB_SbsMember
$ 1,052,908us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= SIEB_SbsMember