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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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