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D - SUBORDINATED BORROWINGS AND SECURED DEMAND NOTE RECEIVABLE (Details) (SBS, USD $)
Dec. 31, 2014
Dec. 31, 2013
SBS
   
Payable to affiliate (a) $ 1,200,000us-gaap_DueToAffiliateCurrentAndNoncurrent
/ dei_LegalEntityAxis
= SIEB_SbsMember
$ 1,200,000us-gaap_DueToAffiliateCurrentAndNoncurrent
/ dei_LegalEntityAxis
= SIEB_SbsMember
Payable to clearing broker 4,000,000SIEB_PayableToClearingBroker
/ dei_LegalEntityAxis
= SIEB_SbsMember
  
Subordinated debt $ 5,200,000us-gaap_SubordinatedDebt
/ dei_LegalEntityAxis
= SIEB_SbsMember
$ 1,200,000us-gaap_SubordinatedDebt
/ dei_LegalEntityAxis
= SIEB_SbsMember