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Note 5 - Transactions With Affiliated Companies - Investments in Affiliated Companies (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Investments, fair value |  |  | $ 720,026 |
Unrealized Gain (Loss) on Investments | $ 608 | $ (36) | (6,929) | $ (2,273)
Net realized gain (loss) on investments | (16,529) | (929) | (16,697) | (899)
Investments, fair value | 715,391 |  | 715,391 |
Investment, Affiliated Issuer, Noncontrolled [Member] |  |  |  |
Investments, fair value | 846 |  | 0 |
Purchases | 0 |  | 0 |
Principal payments | 0 |  | 0 |
Transfers in/(out) at fair value | 0 |  | 0 |
Dividends declared | 0 |  |  |
Unrealized Gain (Loss) on Investments | 60 | 0 | 906 | 0
Net realized gain (loss) on investments | 0 |  | 0 |
Investments, fair value | 906 |  | 906 |
Discount accretion |  |  | 0 |
Investment, Affiliated Issuer, Noncontrolled [Member] | Cadrenal Therapeutics, Inc. [Member] |  |  |  |
Investments, fair value | 846 |  | 0 |
Purchases | 0 |  | 0 |
Principal payments | 0 |  | 0 |
Transfers in/(out) at fair value | 0 |  | 0 |
Dividends declared | 0 |  |  |
Unrealized Gain (Loss) on Investments | 60 |  | 906 |
Net realized gain (loss) on investments | 0 |  | 0 |
Investments, fair value | 906 |  | 906 |
Discount accretion |  |  | 0 |
Investment, Affiliated Issuer, Controlled [Member] |  |  |  |
Investments, fair value |  | 0 |  | 0
Purchases |  | 0 |  | 0
Principal payments |  | (200) |  | (250)
Transfers in/(out) at fair value |  | 0 |  | 0
Dividends declared |  | 0 |  |
Unrealized Gain (Loss) on Investments | 0 | 1,400 | 0 | 1,450
Net realized gain (loss) on investments | $ 0 | (1,200) | $ 0 | (1,200)
Investments, fair value |  | 0 |  | 0
Discount accretion |  |  |  | 0
Investment, Affiliated Issuer, Controlled [Member] | HESP LLC [Member] |  |  |  |
Investments, fair value |  | 0 |  | 0
Purchases |  | 0 |  | 0
Principal payments |  | (200) |  | (250)
Transfers in/(out) at fair value |  | 0 |  | 0
Dividends declared |  | 0 |  |
Unrealized Gain (Loss) on Investments |  | 1,400 |  | 1,450
Net realized gain (loss) on investments |  | (1,200) |  | (1,200)
Investments, fair value |  | $ 0 |  | 0
Discount accretion |  |  |  | $ 0

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