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

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=SIEB_SbsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |