XML 66 R56.htm IDEA: XBRL DOCUMENT
v3.21.2

Referral Fees (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Referral Fees |  |  |  |
Referral fees | $ 353,000 | $ 162,000 | $ 760,000 | $ 273,000

X
- 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