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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Investments, Cost [Abstract] |  |
Margin loans extended | $ 354.0 | $ 365.4
Receivables from customers | $ 51.9 | $ 52.1

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- Definition Margin loans extended. + References No definition available. + Details
Name: | sieb_MarginLoansExtended
Namespace Prefix: | sieb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations. + References No definition available. + Details
Name: | sieb_ReceivablesFromCustomers1
Namespace Prefix: | sieb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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