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Consolidated Schedule of Investments (Unaudited) (Details Textual) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Jul. 31, 2023 | Nov. 09, 2022
--- | --- | --- | --- | ---
Debt Instrument, Face Amount | $ 615.0 | $ 615.0 |  |
Percentage of Nonqualifying Assets on a Cost Basis | 4.90% | 4.70% |  |
Percentage of Nonqualifying Assets on a Fair Value Basis | 1.50% | 2.70% |  |
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | DropOff, Inc. [Member] |  |  |  |
Investment, Interest Rate, Paid in Kind | 4.50% | 4.50% |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Medical Device Sector [Member] | Aulea Medical Inc 1[Member] |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  | 660,537 |
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member] | Co-lender [Member] |  |  |  |
Investment Owned, Net Assets, Percentage |  | 30.00% |  |
Horizon Technology Finance Corporation [Member] | Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member] |  |  |  |
Investment Owned, Net Assets, Percentage | 70.00% | 70.00% |  |
Asset-backed Notes 2022 [Member] |  |  |  |
Debt Instrument, Face Amount | $ 100.0 | $ 100.0 |  | $ 157.8
Asset-backed Notes 2022 [Member] | Affiliated Entity [Member] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 100.0

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