Term of notes payable.

No definition available.

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Namespace Prefix:	SIEB_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The average effective interest rate during the reporting period.

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+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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+ Details

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

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=SIEB_PromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=SIEB_WeedenPrimeServicesLLCMember
Namespace Prefix:
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Balance Type:
Period Type:

Note Payable - Related Party (Details) - USD ($)	Dec. 02, 2019	Dec. 31, 2019
Note payable		$ 3,000,000
Promissory Note [Member] \| Weeden Prime Services LLC [Member]
Note payable	$ 3,000,000
Term of notes payable	1 year
Interest rate on notes payable	4.00%
Interest expense	$ 10,000
Maturity of notes payable	Dec. 02, 2020