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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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration