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F - NET CAPITAL (Details Narrative) (SBS, USD $) | Dec. 31, 2014 | Dec. 31, 2013
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SBS |  |
Net capital | $ 22,807,796 us-gaap_MinimumNetCapitalRequiredForEntity1 / dei_LegalEntityAxis = SIEB_SbsMember | $ 18,271,172 us-gaap_MinimumNetCapitalRequiredForEntity1 / dei_LegalEntityAxis = SIEB_SbsMember
Excess of required capital | $ 22,557,796 SIEB_MinimumNetCapitalRequiredForEntityExcess / dei_LegalEntityAxis = SIEB_SbsMember | $ 18,021,172 SIEB_MinimumNetCapitalRequiredForEntityExcess / dei_LegalEntityAxis = SIEB_SbsMember

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- Definition custom:MinimumNetCapitalRequiredForEntityExcess + References No definition available. + Details
Name: | SIEB_MinimumNetCapitalRequiredForEntityExcess
Namespace Prefix: | SIEB_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Minimum amount of net capital required to be maintained by the entity to engage in securities transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Subparagraph i -Article 15c3 -Subsection a + Details
Name: | us-gaap_MinimumNetCapitalRequiredForEntity1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant