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Note 4 - Investments (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | March 31, 2025 |  |  | December 31, 2024 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 699,761 |  |  | $ | 643,567 |  |  | $ | 678,167 |  |  | $ | 638,779 |
Warrants |  |  | 16,120 |  |  |  | 18,603 |  |  |  | 15,956 |  |  |  | 18,277 |
Other |  |  | 36,723 |  |  |  | 13,697 |  |  |  | 36,709 |  |  |  | 14,637 |
Equity |  |  | 37,988 |  |  |  | 13,686 |  |  |  | 35,942 |  |  |  | 26,198 |
Total investments |  | $ | 790,592 |  |  | $ | 689,553 |  |  | $ | 766,774 |  |  | $ | 697,891 |
|  | March 31, 2025 |  |  | December 31, 2024 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 138,360 |  |  | $ | 116,174 |  |  | $ | 118,221 |  |  | $ | 97,562 |
Medical Device |  |  | 220,360 |  |  |  | 192,105 |  |  |  | 213,564 |  |  |  | 205,634 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 518 |  |  |  | 3,547 |  |  |  | 11,711 |  |  |  | 14,763 |
Consumer-Related |  |  | 74,805 |  |  |  | 27,362 |  |  |  | 74,421 |  |  |  | 36,667 |
Data Storage |  |  | 417 |  |  |  | 322 |  |  |  | 417 |  |  |  | 350 |
Internet and Media |  |  | 329 |  |  |  | 911 |  |  |  | 329 |  |  |  | 999 |
Networking |  |  | 10,076 |  |  |  | 9,826 |  |  |  | 10,070 |  |  |  | 9,827 |
Semiconductors |  |  | 45 |  |  |  | — |  |  |  | 45 |  |  |  | — |
Software |  |  | 161,916 |  |  |  | 159,213 |  |  |  | 154,040 |  |  |  | 151,043 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency |  |  | 9,824 |  |  |  | 9,713 |  |  |  | 9,818 |  |  |  | 9,712 |
Other Sustainability |  |  | 65,329 |  |  |  | 64,109 |  |  |  | 66,151 |  |  |  | 66,079 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 17,252 |  |  |  | 14,661 |  |  |  | 16,704 |  |  |  | 13,701 |
Other |  |  | 39,552 |  |  |  | 40,166 |  |  |  | 39,533 |  |  |  | 40,144 |
Software |  |  | 51,809 |  |  |  | 51,444 |  |  |  | 51,750 |  |  |  | 51,410 |
Total investments |  | $ | 790,592 |  |  | $ | 689,553 |  |  | $ | 766,774 |  |  | $ | 697,891 |

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