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Note 4 - Investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | December 31, 2024 |  |  | December 31, 2023 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 678,167 |  |  | $ | 638,779 |  |  | $ | 721,231 |  |  | $ | 670,172 |
Warrants |  |  | 15,956 |  |  |  | 18,277 |  |  |  | 16,526 |  |  |  | 24,594 |
Other |  |  | 36,709 |  |  |  | 14,637 |  |  |  | 6,982 |  |  |  | 6,430 |
Equity |  |  | 35,942 |  |  |  | 26,198 |  |  |  | 14,443 |  |  |  | 7,889 |
Total investments |  | $ | 766,774 |  |  | $ | 697,891 |  |  | $ | 759,182 |  |  | $ | 709,085 |
|  | December 31, 2024 |  |  | December 31, 2023 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 118,221 |  |  | $ | 97,562 |  |  | $ | 145,544 |  |  | $ | 117,781 |
Medical Device |  |  | 213,564 |  |  |  | 205,634 |  |  |  | 147,064 |  |  |  | 145,019 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 11,711 |  |  |  | 14,763 |  |  |  | 19,192 |  |  |  | 22,188 |
Consumer-Related |  |  | 74,421 |  |  |  | 36,667 |  |  |  | 105,669 |  |  |  | 101,327 |
Data Storage |  |  | 417 |  |  |  | 350 |  |  |  | 417 |  |  |  | 418 |
Internet and Media |  |  | 329 |  |  |  | 999 |  |  |  | 329 |  |  |  | 1,582 |
Networking |  |  | 10,070 |  |  |  | 9,827 |  |  |  | 5,451 |  |  |  | 5,297 |
Power Management |  |  | — |  |  |  | — |  |  |  | 1,585 |  |  |  | 2,700 |
Semiconductors |  |  | 45 |  |  |  | — |  |  |  | 45 |  |  |  | — |
Software |  |  | 154,040 |  |  |  | 151,043 |  |  |  | 164,133 |  |  |  | 160,749 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency |  |  | 9,818 |  |  |  | 9,712 |  |  |  | 111 |  |  |  | 13 |
Other Sustainability |  |  | 66,151 |  |  |  | 66,079 |  |  |  | 98,906 |  |  |  | 80,370 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 16,704 |  |  |  | 13,701 |  |  |  | 19,735 |  |  |  | 19,701 |
Other |  |  | 39,533 |  |  |  | 40,144 |  |  |  | 102 |  |  |  | 1,366 |
Software |  |  | 51,750 |  |  |  | 51,410 |  |  |  | 50,899 |  |  |  | 50,574 |
Total investments |  | $ | 766,774 |  |  | $ | 697,891 |  |  | $ | 759,182 |  |  | $ | 709,085 |

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