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Consolidated Schedule of Investments (Unaudited) (Details Textual) - USD ($) $ in Thousands | Aug. 06, 2025 | Sep. 30, 2025 | Aug. 05, 2025 | Dec. 31, 2024 | Nov. 09, 2022
--- | --- | --- | --- | --- | ---
Debt Instrument, Face Amount |  | $ 757,750 |  | $ 716,078 |
HIMV LLC [Member] |  |  |  |  |
Subsidiary, Ownership Percentage, Parent | 100.00% |  |  |  |
HIMV LLC [Member] | Co-lender [Member] |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  |  | 30.00% |  |
Horizon Technology Finance Corporation [Member] | HIMV LLC [Member] |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  | 70.00% |  |
Asset-backed Notes 2022 [Member] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 0 |  | $ 81,078 | $ 157,800
Asset-backed Notes 2022 [Member] | Affiliated Entity [Member] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 100,000
Assets of Powerscourt Investments XXV, LP [Member] |  |  |  |  |
Asset Acquisition, Consideration Transferred | $ 22,500 |  |  |  |
Fair Value of Assets Acquired | 36,500 |  |  |  |
Assets of Powerscourt Investments XXV, LP [Member] | Debt Securities [Member] |  |  |  |  |
Fair Value of Assets Acquired | $ 34,900 |  |  |  |

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