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Note 4 - Investments (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | September 30, 2025 |  |  | December 31, 2024 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 585,292 |  |  | $ | 560,190 |  |  | $ | 678,167 |  |  | $ | 638,779 |
Warrants |  |  | 15,370 |  |  |  | 16,444 |  |  |  | 15,956 |  |  |  | 18,277 |
Other |  |  | 46,409 |  |  |  | 3,181 |  |  |  | 36,709 |  |  |  | 14,637 |
Equity |  |  | 39,122 |  |  |  | 23,699 |  |  |  | 35,942 |  |  |  | 26,198 |
Total investments |  | $ | 686,193 |  |  | $ | 603,514 |  |  | $ | 766,774 |  |  | $ | 697,891 |
|  | September 30, 2025 |  |  | December 31, 2024 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 101,585 |  |  | $ | 66,100 |  |  | $ | 118,221 |  |  | $ | 97,562 |
Medical Device |  |  | 219,162 |  |  |  | 212,678 |  |  |  | 213,564 |  |  |  | 205,634 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 522 |  |  |  | 3,321 |  |  |  | 11,711 |  |  |  | 14,763 |
Consumer-Related |  |  | 59,389 |  |  |  | 25,675 |  |  |  | 74,421 |  |  |  | 36,667 |
Data Storage |  |  | 417 |  |  |  | 163 |  |  |  | 417 |  |  |  | 350 |
Internet and Media |  |  | 329 |  |  |  | 151 |  |  |  | 329 |  |  |  | 999 |
Networking |  |  | 364 |  |  |  | 119 |  |  |  | 10,070 |  |  |  | 9,827 |
Semiconductors |  |  | — |  |  |  | — |  |  |  | 45 |  |  |  | — |
Software |  |  | 151,884 |  |  |  | 142,835 |  |  |  | 154,040 |  |  |  | 151,043 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative Energy |  |  | 4,859 |  |  |  | 4,845 |  |  |  | — |  |  |  | — |
Energy Efficiency |  |  | 125 |  |  |  | 25 |  |  |  | 9,818 |  |  |  | 9,712 |
Other Sustainability |  |  | 44,562 |  |  |  | 44,659 |  |  |  | 66,151 |  |  |  | 66,079 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 17,581 |  |  |  | 19,309 |  |  |  | 16,704 |  |  |  | 13,701 |
Other |  |  | 39,557 |  |  |  | 35,359 |  |  |  | 39,533 |  |  |  | 40,144 |
Software |  |  | 45,857 |  |  |  | 48,275 |  |  |  | 51,750 |  |  |  | 51,410 |
Total investments |  | $ | 686,193 |  |  | $ | 603,514 |  |  | $ | 766,774 |  |  | $ | 697,891 |

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