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Revenue Recognition - Schedule of Represents Loss Related to Principal Transactions (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Principal transactions and proprietary trading
Realized and unrealized gain on primarily riskless principal transactions	$ 3,712,000		$ 3,443,000
Increase (Decrease) on realized and unrealized gain on primarily riskless principal transactions		$ 269,000
Unrealized gain on investment in equity security	9,233,000
Increase (Decrease) on unrealized gain on investment in equity security		9,233,000
Realized and unrealized gain on portfolio of U.S. government securities	16,000		63,000
Increase (Decrease) on realized and unrealized gain on portfolio of U.S. government securities		(47,000)
Total Principal transactions and proprietary trading	$ 12,961,000		$ 3,506,000
Increase (Decrease) on principal transactions and proprietary trading		$ 9,455,000

X

- Definition

Increase (Decrease) on Realized and Unrealized Gain on Securities.

+ References

No definition available.

+ Details

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X

- Definition

Total Principal transactions and proprietary trading.

+ References

No definition available.

+ Details

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Namespace Prefix:	sieb_
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X

- Definition

Represents the value of unrealized gain on investment in equity security.

+ References

No definition available.

+ Details

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- Definition

Realized and unrealized gain on portfolio of U.S. government securities.

+ References

No definition available.

+ Details

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X

- Definition

Realized and unrealized gain on portfolio of U.S. government securities.

+ References

No definition available.

+ Details

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- Definition

Unrealized gain on investment in equity security.

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

Amount of realized and unrealized gain (loss), from the firm's direct investment activity, conducted separately from customer trading activities, and includes, but is not limited to, investments in private equity, alternative investment products, real estate, and exchanges and memberships.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(h))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(g))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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- Definition

Amount of realized and unrealized gain (loss) resulting from the difference between acquisition price and selling price or fair value of trading assets and trading liabilities, and from the firm's direct investment activity, conducted separately from customer trading activities, including, but not limited to, investments in private equity, alternative investment products, real estate, and exchanges and memberships.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 320
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479048/940-320-50-1

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