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Deferred Contract Incentive (Narrative) (Details) - National Financial Services LLC [Member] - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Business development credit |  |  | $ 3,000,000 |  |
Contra expense | $ 213,000 | $ 0 | 425,000 | $ 0 |
Deferred contract incentive | $ 2,300,000 |  | $ 2,300,000 |  | $ 2,700,000

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- Definition Contra expense during the period. + References No definition available. + Details
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Period Type: | duration

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- Definition Deferred contract incentive. + References No definition available. + Details
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Namespace Prefix: | SIEB_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Business development involves the development of products and services, their delivery, design and their implementation. Business development includes a number of techniques designed to grow an economic enterprise. Such techniques include, but are not limited to, assessments of marketing opportunities and target markets, intelligence gathering on customers and competitors, generating leads for possible sales, follow-up sales activity, formal proposal writing and business model design. Business development involves evaluating a business and then realizing its full potential, using such tools as marketing, sales, information management and customer service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(6)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |