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Referral Fees (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Referral Fees
Referral fees	$ 154,000		$ 427,000

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- Definition

Referral fees.

+ References

No definition available.

+ Details

Name:	SIEB_ReferralFees
Namespace Prefix:	SIEB_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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