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Revenue Recognition (Schedule of Performance Obligation) (Details)	3 Months Ended
	Mar. 31, 2022
One [Member]
Revenue Stream	Commissions and fees, Principal transactions and proprietary trading, Market making, Stock borrow / stock loan, Advisory fees
Performance Obligation	Provide financial services to customers and counterparties
Two [Member]
Revenue Stream	Interest, marketing and distribution fees, Other income
Performance Obligation	n / a

X

- Definition

Description of good or service to be transferred in contract with customer. Includes, but is not limited to, arrangement for another party to transfer good or service to customer.

+ References

No definition available.

+ Details

Name:	SIEB_RevenueStreamDescriptionOfGoodOrService
Namespace Prefix:	SIEB_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Description of good or service to be transferred in contract with customer. Includes, but is not limited to, arrangement for another party to transfer good or service to customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

+ Details

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

X

- Details

Name:	srt_ProductOrServiceAxis=SIEB_ProductOrServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=SIEB_ProductOrServiceOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: