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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (M-O) (Details) $ in Thousands			3 Months Ended		6 Months Ended				12 Months Ended
		Aug. 14, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)		Jun. 30, 2024 USD ($)		Dec. 31, 2024 USD ($)	Mar. 10, 2025 USD ($)	Feb. 27, 2025	Jan. 06, 2025	Nov. 15, 2024	May 03, 2024 company
Accounting Policies [Line Items]
Equity method investments			$ 86,042		$ 86,042				$ 85,487
Income (loss) from equity method investments			25,603	$ 10	25,051	[1]	$ 6	[1]
Net Investment Income					78,823				82,462
Noncontrolling interest, common stock percent										0.60%
Noncontrolling interest, continues to own percent										89.40%
Noncontrolling interest, estimated recognized loss amount										$ 1,575
Variable interest entity, primary beneficiary, maximum loss exposure, amount			1,468		1,468				2,057
Agent fees			0	$ 494	0		866
Number of brand apparel operating companies | company														2
Repayments of notes payable	[1]				13,138		$ 5,690
GA Holdings
Accounting Policies [Line Items]
Income (loss) from equity method investments			(3,190)		(3,639)
Joann Retail
Accounting Policies [Line Items]
Equity method investments			0		0
Net Investment Income					6,163
SW-B. Riley Retail
Accounting Policies [Line Items]
Equity method investments			7,219		$ 7,219				$ 3,025
Minimum
Accounting Policies [Line Items]
Cash fee percentage					7.00%
Carried interest percentage					8.00%
Minimum | Related Party | BRC Partners Opportunity Fund, LP
Accounting Policies [Line Items]
Ownership, percentage												13.40%
Maximum
Accounting Policies [Line Items]
Cash fee percentage					10.00%
Carried interest percentage					15.00%
Maximum | Related Party | BRC Partners Opportunity Fund, LP
Accounting Policies [Line Items]
Ownership, percentage												58.20%
Weighted Average | Discounted cash flow
Accounting Policies [Line Items]
Noncontrolling interest, measurement input										0.75
Weighted Average | Market approach
Accounting Policies [Line Items]
Noncontrolling interest, measurement input										0.25
GA Holdings
Accounting Policies [Line Items]
Rate of equity interests													44.20%
Joann Retail
Accounting Policies [Line Items]
Income (loss) from equity method investments			(1,714)
Rate of equity interests											47.40%
Excess amount in balance of equity method investment			$ 30,420		$ 30,420
Bicoastal Alliance, LLC
Accounting Policies [Line Items]
Rate of equity interests		50.00%												50.00%
Repayments of notes payable		$ 700
Gain (loss) on disposition of business					$ 28,411
BRC Partners Opportunity Fund, LP
Accounting Policies [Line Items]
Rate of equity interests												86.60%
BRC Partners Opportunity Fund, LP | Minimum
Accounting Policies [Line Items]
Rate of equity interests									10.70%
BRC Partners Opportunity Fund, LP | Maximum
Accounting Policies [Line Items]
Rate of equity interests									22.60%
[1] Amounts presented contain results from both continuing and discontinued operations. Refer to Note 4 – Discontinued Operations and Assets Held for Sale for additional information regarding cash flow associated with the results of discontinued operations.

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