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

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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Period Type: | instant

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
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Period Type: | instant

X
- Details
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