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Note 4 - Investments (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | June 30, 2025 |  |  | December 31, 2024 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 636,261 |  |  | $ | 579,171 |  |  | $ | 678,167 |  |  | $ | 638,779 |
Warrants |  |  | 15,565 |  |  |  | 21,629 |  |  |  | 15,956 |  |  |  | 18,277 |
Other |  |  | 55,924 |  |  |  | 8,451 |  |  |  | 36,709 |  |  |  | 14,637 |
Equity |  |  | 38,098 |  |  |  | 13,402 |  |  |  | 35,942 |  |  |  | 26,198 |
Total investments |  | $ | 745,848 |  |  | $ | 622,653 |  |  | $ | 766,774 |  |  | $ | 697,891 |
|  | June 30, 2025 |  |  | December 31, 2024 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 120,283 |  |  | $ | 84,043 |  |  | $ | 118,221 |  |  | $ | 97,562 |
Medical Device |  |  | 239,170 |  |  |  | 209,087 |  |  |  | 213,564 |  |  |  | 205,634 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 517 |  |  |  | 3,532 |  |  |  | 11,711 |  |  |  | 14,763 |
Consumer-Related |  |  | 65,352 |  |  |  | 25,066 |  |  |  | 74,421 |  |  |  | 36,667 |
Data Storage |  |  | 417 |  |  |  | 330 |  |  |  | 417 |  |  |  | 350 |
Internet and Media |  |  | 329 |  |  |  | 605 |  |  |  | 329 |  |  |  | 999 |
Networking |  |  | 364 |  |  |  | 121 |  |  |  | 10,070 |  |  |  | 9,827 |
Semiconductors |  |  | — |  |  |  | — |  |  |  | 45 |  |  |  | — |
Software |  |  | 165,371 |  |  |  | 158,536 |  |  |  | 154,040 |  |  |  | 151,043 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative Energy |  |  | 4,854 |  |  |  | 4,845 |  |  |  | — |  |  |  | — |
Energy Efficiency |  |  | 9,934 |  |  |  | 9,828 |  |  |  | 9,818 |  |  |  | 9,712 |
Other Sustainability |  |  | 30,449 |  |  |  | 23,008 |  |  |  | 66,151 |  |  |  | 66,079 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 17,350 |  |  |  | 9,940 |  |  |  | 16,704 |  |  |  | 13,701 |
Other |  |  | 39,575 |  |  |  | 42,194 |  |  |  | 39,533 |  |  |  | 40,144 |
Software |  |  | 51,883 |  |  |  | 51,518 |  |  |  | 51,750 |  |  |  | 51,410 |
Total investments |  | $ | 745,848 |  |  | $ | 622,653 |  |  | $ | 766,774 |  |  | $ | 697,891 |

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