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NONCONTROLLING INTERESTS (Details)	Jun. 30, 2026	Dec. 31, 2025	Mar. 10, 2025	Jan. 06, 2025
BRC Partners Opportunity Fund, LP
Noncontrolling Interest [Line Items]
Rate of equity interests	22.60%			86.60%
B. Riley Securities Holdings, Inc.
Noncontrolling Interest [Line Items]
Ownership, percentage	92.90%	90.70%
Minority interest, remaining			89.40%
B. Riley Securities Holdings, Inc. | Capital Markets segment
Noncontrolling Interest [Line Items]
Ownership, percentage			0.60%
BRC Partners Opportunity Fund, LP | BRC Trust | Related Party
Noncontrolling Interest [Line Items]
Ownership, percentage				58.20%

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

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