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Note 1 - Organization (Details Textual) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Aug. 13, 2019
Debt Instrument, Face Amount	$ 715	$ 615
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%
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 2019 [Member]
Debt Instrument, Face Amount			$ 160
Asset-backed Notes 2019 [Member] | Affiliated Entity [Member]
Debt Instrument, Face Amount			$ 100

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