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I - OTHER (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
General and administrative services $ 2,033,000us-gaap_OtherGeneralAndAdministrativeExpense $ 2,245,000us-gaap_OtherGeneralAndAdministrativeExpense $ 2,374,000us-gaap_OtherGeneralAndAdministrativeExpense
Siebert, Brandford, Shank Financial LLC and Subsidiary      
General and administrative services 100,000us-gaap_OtherGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= SIEB_SbsFinancialMember
   
SBS      
General and administrative services   $ 100,000us-gaap_OtherGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= SIEB_SbsMember
$ 75,000us-gaap_OtherGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= SIEB_SbsMember