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J - Commitments, Contingencies And Othe (Details) (USD $)	Dec. 31, 2014
2015	$ 615,000us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths
2016	482,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwo
2017	80,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearThree
Future minimum base rental payments under these operating leases	1,177,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
SBS
2015	1,043,000us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths / dei_LegalEntityAxis = SIEB_SbsMember
2016	886,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwo / dei_LegalEntityAxis = SIEB_SbsMember
2017	639,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearThree / dei_LegalEntityAxis = SIEB_SbsMember
2018	627,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFour / dei_LegalEntityAxis = SIEB_SbsMember
2019	587,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFive / dei_LegalEntityAxis = SIEB_SbsMember
Thereafter	185,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingAfterYearFive / dei_LegalEntityAxis = SIEB_SbsMember
Future minimum base rental payments under these operating leases	$ 3,967,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue / dei_LegalEntityAxis = SIEB_SbsMember

X

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

+ Details

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X

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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