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Fair Value Measurements (Details) - Schedule of estimated fair values - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Estimated Fair Values Abstract |  |
Equity method investment in related party | $ 2,584,000 | $ 8,156,000

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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_
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Balance Type: | na
Period Type: | duration