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Revenue Recognition (Narrative) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |  |
Stock borrow / stock loan | $ 3,578,000 | $ 1,847,000
Gross revenue from stock borrow/ Stock loan | 7,465,000 | 4,830,000
Expenses from stock borrow/stock loan | $ 3,887,000 | $ 2,983,000

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- Definition Expenses from stock borrow/stock loan. + References No definition available. + Details
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- Definition Gross revenue from stock borrow/ Stock loan. + References No definition available. + Details
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Namespace Prefix: | SIEB_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Revenue from stock borrow or stock loan. + References No definition available. + Details
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Namespace Prefix: | SIEB_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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