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

X

- Definition

custom:MinimumNetCapitalRequiredForEntityExcess

+ References

No definition available.

+ Details

Name:	SIEB_MinimumNetCapitalRequiredForEntityExcess
Namespace Prefix:	SIEB_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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