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Fair Value Measurements (Details) - Schedule of estimated fair values - USD ($) | Jun. 30, 2023 | Dec. 31, 2022
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Schedule Of Estimated Fair Values Abstract |  |
Equity method investment in related party | $ 2,510,000 | $ 2,584,000

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- Definition Equity method investment in related party. + References No definition available. + Details
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Namespace Prefix: | sieb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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