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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments, fair value |  | $ 709,085 |  |
Net unrealized appreciation (depreciation) on investments |  | (18,785) | $ (48,780) | $ (5,552)
Net realized gain (loss) on investments |  | (34,631) | (29,702) | (9,484)
Investments, fair value |  | 697,891 | 709,085 |
Interest Income, Operating, Paid in Kind |  | 3,261 | 8,433 | (0)
Investment, Affiliated Issuer, Noncontrolled [Member] |  |  |  |
Investments, fair value |  | 1,132 | 0 |
Purchases |  | 247 | 11 |
Reductions |  | (1,470) | (11,000) |
Transfers in/(out) at fair value |  | 0 | 38,599 |
Discount accretion |  | 0 | 35 |
Net unrealized appreciation (depreciation) on investments |  | 8,361 | (26,513) | 0
Net realized gain (loss) on investments |  | 37 | 0 | 30
Investments, fair value |  | 8,307 | 1,132 | 0
Interest income |  | 0 | 1,245 | 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member] |  |  |  |
Investments, fair value |  | 0 | 0 |
Purchases |  | 3 | 0 |
Reductions |  | (40) | 0 |
Transfers in/(out) at fair value |  | 0 | 0 |
Discount accretion |  | 0 | 0 |
Net unrealized appreciation (depreciation) on investments |  | 0 | 0 |
Net realized gain (loss) on investments |  | 37 | 0 |
Investments, fair value |  | 0 | 0 | 0
Interest income |  | 0 | 0 |
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] |  |  |  |
Investments, fair value |  | 1,132 | 0 |
Purchases |  | 244 | 11 |
Reductions |  | (1,430) | (11,000) |
Transfers in/(out) at fair value |  | 0 | 39,505 |
Discount accretion |  | 0 | 35 |
Net unrealized appreciation (depreciation) on investments |  | 8,361 | (27,419) |
Net realized gain (loss) on investments |  | 0 | 0 |
Investments, fair value |  | 8,307 | 1,132 | 0
Interest income |  | 0 | 1,245 |
Investment, Affiliated Issuer, Noncontrolled [Member] | Cadrenal Therapeutics, Inc. [Member] |  |  |  |
Investments, fair value | [1] | 0 | 0 |
Purchases | [1] |  | 0 |
Reductions | [1] |  | 0 |
Transfers in/(out) at fair value | [1] |  | (906) |
Discount accretion | [1] |  | 0 |
Net unrealized appreciation (depreciation) on investments | [1] |  | 906 |
Net realized gain (loss) on investments | [1] |  | 0 |
Investments, fair value | [1] |  | 0 | 0
Interest income | [1] |  | 0 |
Investment, Affiliated Issuer, Controlled [Member] |  |  |  |
Investments, fair value |  | 14,223 | 0 |
Purchases |  | 6,654 | 1,457 |
Reductions |  | (592) | (516) |
Transfers in/(out) at fair value |  | 22,641 | 10,734 |
Discount accretion |  | 16 | 6 |
Net unrealized appreciation (depreciation) on investments |  | (12,754) | 2,222 | 1,450
Net realized gain (loss) on investments |  | 0 | 0 | (1,150)
Investments, fair value |  | 31,819 | 14,223 | 0
Interest income |  | 118 | 17 | 0
Interest Income, Operating, Paid in Kind |  | 1,631 | 320 | 0
Investment, Affiliated Issuer, Controlled [Member] | Investment [Member] |  |  |  |
Interest income |  | 1,749 | 337 |
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] |  |  |  |
Investments, fair value |  | 7,993 | 0 |
Purchases |  | 3,750 | 1,311 |
Reductions |  | 0 | 0 |
Transfers in/(out) at fair value |  | 0 | 4,580 |
Discount accretion |  | 14 | 6 |
Net unrealized appreciation (depreciation) on investments |  | (12,562) | 1,776 |
Net realized gain (loss) on investments |  | 0 | 0 |
Investments, fair value |  | 0 | 7,993 | 0
Interest income |  | 846 | 337 |
Interest Income, Operating, Paid in Kind |  | 805 | 320 |
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member] |  |  |  |
Investments, fair value |  | 6,230 | 0 |
Purchases |  | 227 | 146 |
Reductions |  | (592) | (516) |
Transfers in/(out) at fair value |  | 463 | 6,154 |
Discount accretion |  | 0 | 0 |
Net unrealized appreciation (depreciation) on investments |  | (98) | 446 |
Net realized gain (loss) on investments |  | 0 | 0 |
Investments, fair value |  | 6,230 | 6,230 | $ 0
Interest income |  | 0 | 0 |
Interest Income, Operating, Paid in Kind |  | 0 | 0 |
Investment, Affiliated Issuer, Controlled [Member] | Nexii Building Solutions, Inc [Member] |  |  |  |
Investments, fair value |  | 0 |  |
Purchases |  | 790 |  |
Reductions |  | 0 |  |
Transfers in/(out) at fair value |  | 6,716 |  |
Discount accretion |  | 0 |  |
Net unrealized appreciation (depreciation) on investments |  | 1,041 |  |
Net realized gain (loss) on investments |  | 0 |  |
Investments, fair value |  | 8,547 | 0 |
Interest income |  | 35 |  |
Interest Income, Operating, Paid in Kind |  | 0 |  |
Investment, Affiliated Issuer, Controlled [Member] | Swift Health Systems Inc. [Member] |  |  |  |
Investments, fair value |  | 0 |  |
Purchases |  | 1,887 |  |
Reductions |  | 0 |  |
Transfers in/(out) at fair value |  | 15,462 |  |
Discount accretion |  | 2 |  |
Net unrealized appreciation (depreciation) on investments |  | (1,135) |  |
Net realized gain (loss) on investments |  | 0 |  |
Investments, fair value |  | 17,042 | $ 0 |
Interest income |  | 868 |  |
Interest Income, Operating, Paid in Kind |  | $ 826 |  |
[1] | As of December 31, 2023, the Company no longer owns 5% of more of the portfolio company.

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