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Note 1 - Organization (Details Textual) - Investment, Affiliated Issuer, Controlled [Member] | Mar. 31, 2025
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HIMV LLC [Member] | Co-lender [Member] |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 30.00%
HIMV LLC [Member] | Co-lender [Member] |
Investment Owned, Net Assets, Percentage | 30.00%
HIMV LLC [Member] | Horizon Technology Finance Corporation [Member] |
Investment Owned, Net Assets, Percentage | 70.00%

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