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Note 1 - Organization (Details Textual)	Jun. 30, 2025	Dec. 31, 2024
Investment Owned, Net Assets, Percentage	219.40%	207.60%
Investment, Affiliated Issuer, Controlled [Member]
Investment Owned, Net Assets, Percentage	3.70%	9.50%
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member] | Co-lender [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner	30.00%
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member] | Co-lender [Member]
Investment Owned, Net Assets, Percentage	30.00%
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member] | Horizon Technology Finance Corporation [Member]
Investment Owned, Net Assets, Percentage	70.00%

X

- Definition

Percentage of investment owned to net assets.

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