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v3.21.2

Referral Fees (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Referral Fees |  |  |  |
Referral fees | $ 374,000 | $ 154,000 | $ 1,134,000 | $ 427,000

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- Definition Referral fees. + References No definition available. + Details
Name: | SIEB_ReferralFees
Namespace Prefix: | SIEB_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | SIEB_ReferralFeesAbstract
Namespace Prefix: | SIEB_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration