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Note 4 - Investments (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | September 30, 2024 |  |  | December 31, 2023 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 654,127 |  |  | $ | 633,284 |  |  | $ | 721,231 |  |  | $ | 670,172 |
Warrants |  |  | 17,292 |  |  |  | 18,735 |  |  |  | 16,526 |  |  |  | 24,594 |
Other |  |  | 36,651 |  |  |  | 17,944 |  |  |  | 6,982 |  |  |  | 6,430 |
Equity |  |  | 25,162 |  |  |  | 14,037 |  |  |  | 14,443 |  |  |  | 7,889 |
Total investments |  | $ | 733,232 |  |  | $ | 684,000 |  |  | $ | 759,182 |  |  | $ | 709,085 |
|  | September 30, 2024 |  |  | December 31, 2023 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 126,867 |  |  | $ | 106,865 |  |  | $ | 145,544 |  |  | $ | 117,781 |
Medical Device |  |  | 185,751 |  |  |  | 179,092 |  |  |  | 147,064 |  |  |  | 145,019 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 13,577 |  |  |  | 15,596 |  |  |  | 19,192 |  |  |  | 22,188 |
Consumer-Related |  |  | 74,381 |  |  |  | 54,505 |  |  |  | 105,669 |  |  |  | 101,327 |
Data Storage |  |  | 417 |  |  |  | 409 |  |  |  | 417 |  |  |  | 418 |
Internet and Media |  |  | 329 |  |  |  | 984 |  |  |  | 329 |  |  |  | 1,582 |
Networking |  |  | 10,064 |  |  |  | 9,818 |  |  |  | 5,451 |  |  |  | 5,297 |
Power Management |  |  | 1,585 |  |  |  | 2,700 |  |  |  | 1,585 |  |  |  | 2,700 |
Semiconductors |  |  | 45 |  |  |  | — |  |  |  | 45 |  |  |  | — |
Software |  |  | 136,309 |  |  |  | 132,951 |  |  |  | 164,133 |  |  |  | 160,749 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency |  |  | 9,812 |  |  |  | 9,712 |  |  |  | 111 |  |  |  | 13 |
Other Sustainability |  |  | 66,501 |  |  |  | 66,163 |  |  |  | 98,906 |  |  |  | 80,370 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 16,692 |  |  |  | 14,114 |  |  |  | 19,735 |  |  |  | 19,701 |
Other |  |  | 39,511 |  |  |  | 40,186 |  |  |  | 102 |  |  |  | 1,366 |
Software |  |  | 51,391 |  |  |  | 50,905 |  |  |  | 50,899 |  |  |  | 50,574 |
Total investments |  | $ | 733,232 |  |  | $ | 684,000 |  |  | $ | 759,182 |  |  | $ | 709,085 |

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