XML 78 R67.htm IDEA: XBRL DOCUMENT
v3.24.1.1.u2

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Financial Instruments with Off-Balance Sheet Risk [Abstract] |  |
Margin loans extended | $ 352.0 | $ 338.1
Receivables from customers | 74.7 | 72.8
Unsettled customer transactions |  |

X
- Definition Margin loans extended. + References No definition available. + Details
Name: | sieb_MarginLoansExtended
Namespace Prefix: | sieb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations. + References No definition available. + Details
Name: | sieb_ReceivablesFromCustomers1
Namespace Prefix: | sieb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unsettled customer transactions. + References No definition available. + Details
Name: | sieb_UnsettledCustomerTransactions
Namespace Prefix: | sieb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration