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Property, Office Facilities, and Equipment, Net (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Property, Office Facilities, and Equipment, Net (Details) [Line Items] |  |
Total depreciation expense | $ 81,000 | $ 97,000
Office Building [Member] |  |
Property, Office Facilities, and Equipment, Net (Details) [Line Items] |  |
Build out expense | $ 565,000 | $ 276,000

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- Definition The amount of expense recognized in the current period. + References No definition available. + Details
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Namespace Prefix: | sieb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | sieb_
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Balance Type: | na
Period Type: | duration

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |