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

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