XML 46 R37.htm IDEA: XBRL DOCUMENT v3.19.1

Revenue Recognition (Schedule of Performance Obligation) (Details)	3 Months Ended
	Mar. 31, 2019
One [Member]
Revenue Stream	Principal transactions, Commissions and fees, Advisory fees and additional income
Performance Obligation	Provide security trading services to customer and act as agent
Two [Member]
Revenue Stream	Margin interest, marketing and distribution fees
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

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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 http://asc.fasb.org/extlink&oid=118956577&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: