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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Unamortized discount $ 1,143,000us-gaap_DebtInstrumentUnamortizedDiscount  
Stockholder's equity:    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized shares 49,000,000us-gaap_CommonStockSharesAuthorized 49,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued shares 23,211,846us-gaap_CommonStockSharesIssued 23,211,846us-gaap_CommonStockSharesIssued
Common stock, outstanding shares 22,085,126us-gaap_CommonStockSharesOutstanding 22,085,126us-gaap_CommonStockSharesOutstanding
Treasury Stock Shares 1,126,720us-gaap_TreasuryStockShares 1,126,720us-gaap_TreasuryStockShares
SBS    
Unamortized discount 1,143,359us-gaap_DebtInstrumentUnamortizedDiscount
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Issuer relationships, net of amortization $ 41,212SIEB_IssuerRelationshipsNetOfAmortization
/ dei_LegalEntityAxis
= SIEB_SbsMember