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Revenue Recognition (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |  |  |  |
Stock borrow / stock loan | $ 4,148,000 | $ 2,240,000 | $ 7,726,000 | $ 4,087,000
Gross revenue from stock borrow/ Stock loan | 8,836,000 | 7,021,000 | 16,301,000 | 11,851,000
Expenses from stock borrow/stock loan | $ 4,688,000 | $ 4,781,000 | $ 8,575,000 | $ 7,764,000

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- Definition Expenses from stock borrow/stock loan. + References No definition available. + Details
Name: | SIEB_ExpensesFromStockBorrowOrStockLoan
Namespace Prefix: | SIEB_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Revenue from stock borrow or stock loan. + References No definition available. + Details
Name: | SIEB_RevenueFromStockBorrowOrStockLoan
Namespace Prefix: | SIEB_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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