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Affiliates and Controlled Investments - Schedule of Fair Value with Transactions in Affiliated investments and controlled investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value, Beginning Balance | [1] |  |  | $ 332,710 |
Fair Value, Ending Balance | [2] | $ 413,804 |  | 413,804 |
Interest Income |  | 7,583 | $ 8,121 | 23,518 | $ 23,465
Dividend Income |  | 2,060 | 3,586 | 11,908 | 5,927
CLO Formation JV, LLC |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Net realized gain (loss) |  |  | $ 34 | (410) | $ 34
Controlled Investments |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value, Beginning Balance | [3] |  |  | 83,304 |
Gross Additions | [3],[4] |  |  | 15,936 |
Gross Reductions | [3],[5] |  |  | 8,266 |
Change in Unrealized Appreciation (Depreciation) | [3] |  |  | (6,882) |
Fair Value, Ending Balance | [3] | 84,092 |  | 84,092 |
Interest Income | [3] |  |  | 2,528 |
Dividend Income | [3] |  |  | 9,245 |
Controlled Investments | Great Elm Specialty Finance |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value, Beginning Balance | [3] |  |  | 43,215 |
Gross Additions | [3],[4] |  |  | 2,325 |
Gross Reductions | [3],[5] |  |  | 7,300 |
Change in Unrealized Appreciation (Depreciation) | [3] |  |  | 455 |
Fair Value, Ending Balance | [3] | 38,695 |  | 38,695 |
Interest Income | [3] |  |  | 2,528 |
Dividend Income | [3] |  |  | 644 |
Controlled Investments | Great Elm Specialty Finance | Equity |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value, Beginning Balance | [3] |  |  | 13,482 |
Gross Reductions | [3],[5] |  |  | 567 |
Change in Unrealized Appreciation (Depreciation) | [3] |  |  | 455 |
Fair Value, Ending Balance | [3] | 13,370 |  | 13,370 |
Interest Income | [3] |  |  | 0 |
Dividend Income | [3] |  |  | 644 |
Controlled Investments | Great Elm Specialty Finance | Subordinated Note |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value, Beginning Balance | [3] |  |  | 29,733 |
Gross Additions | [3],[4] |  |  | 2,325 |
Gross Reductions | [3],[5] |  |  | 6,733 |
Fair Value, Ending Balance | [3] | 25,325 |  | 25,325 |
Interest Income | [3] |  |  | 2,528 |
Controlled Investments | CLO Formation JV, LLC |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value, Beginning Balance | [3] |  |  | 40,089 |
Gross Additions | [3],[4] |  |  | 13,611 |
Gross Reductions | [3],[5] |  |  | 966 |
Change in Unrealized Appreciation (Depreciation) | [3] |  |  | (7,337) |
Fair Value, Ending Balance | [3] | 45,397 |  | 45,397 |
Dividend Income | [3] |  |  | 8,601 |
Controlled Investments | CLO Formation JV, LLC | Equity |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value, Beginning Balance | [3] |  |  | 40,089 |
Gross Additions | [3],[4] |  |  | 13,611 |
Gross Reductions | [3],[5] |  |  | 966 |
Change in Unrealized Appreciation (Depreciation) | [3] |  |  | (7,337) |
Fair Value, Ending Balance | [3] | $ 45,397 |  | 45,397 |
Dividend Income | [3] |  |  | $ 8,601 |
[1] | As of period end, the aggregate gross unrealized appreciation for all securities in which there was an excess of value over tax cost was $16,176; the aggregate gross unrealized depreciation for all securities in which there was an excess of tax cost over value was $37,761; the net unrealized depreciation was $(21,585); the aggregate cost of securities for Federal income tax purposes was $354,295.
[2] | As of period end, the aggregate gross unrealized appreciation for all securities in which there was an excess of value over tax cost was $20,968; the aggregate gross unrealized depreciation for all securities in which there was an excess of tax cost over value was $(70,085); the net unrealized depreciation was $(49,117); the aggregate cost of securities for Federal income tax purposes was $438,585.
[3] | Non-unitized equity investments are disclosed with percentage ownership in lieu of quantity.
[4] | Gross additions include increases resulting from new or additional portfolio investments, capitalized PIK income, accretion of discounts and the exchange of one or more existing securities for one or more new securities.
[5] | Gross reductions include decreases resulting from principal collections related to investment repayments or sales and the exchange of one or more existing securities for one or more new securities.

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