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Note 4 - Investments (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | March 31, 2024 |  |  | December 31, 2023 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 719,500 |  |  | $ | 670,773 |  |  | $ | 721,231 |  |  | $ | 670,172 |
Warrants |  |  | 16,636 |  |  |  | 23,928 |  |  |  | 16,526 |  |  |  | 24,594 |
Other |  |  | 13,844 |  |  |  | 9,192 |  |  |  | 6,982 |  |  |  | 6,430 |
Equity |  |  | 15,193 |  |  |  | 7,223 |  |  |  | 14,443 |  |  |  | 7,889 |
Total investments |  | $ | 765,173 |  |  | $ | 711,116 |  |  | $ | 759,182 |  |  | $ | 709,085 |
|  | March 31, 2024 |  |  | December 31, 2023 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 142,108 |  |  | $ | 124,741 |  |  | $ | 145,544 |  |  | $ | 117,781 |
Medical Device |  |  | 164,060 |  |  |  | 161,155 |  |  |  | 147,064 |  |  |  | 145,019 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 17,327 |  |  |  | 20,185 |  |  |  | 19,192 |  |  |  | 22,188 |
Consumer-Related |  |  | 105,165 |  |  |  | 99,876 |  |  |  | 105,669 |  |  |  | 101,327 |
Data Storage |  |  | 416 |  |  |  | 426 |  |  |  | 417 |  |  |  | 418 |
Internet and Media |  |  | 328 |  |  |  | 1,592 |  |  |  | 329 |  |  |  | 1,582 |
Networking |  |  | 3,231 |  |  |  | 3,091 |  |  |  | 5,451 |  |  |  | 5,297 |
Power Management |  |  | 1,585 |  |  |  | 2,700 |  |  |  | 1,585 |  |  |  | 2,700 |
Semiconductors |  |  | 45 |  |  |  | — |  |  |  | 45 |  |  |  | — |
Software |  |  | 159,094 |  |  |  | 154,908 |  |  |  | 164,133 |  |  |  | 160,749 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency |  |  | 111 |  |  |  | 8 |  |  |  | 111 |  |  |  | 13 |
Other Sustainability |  |  | 100,854 |  |  |  | 71,060 |  |  |  | 98,906 |  |  |  | 80,370 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 19,759 |  |  |  | 19,729 |  |  |  | 19,735 |  |  |  | 19,701 |
Other |  |  | 102 |  |  |  | 949 |  |  |  | 102 |  |  |  | 1,366 |
Software |  |  | 50,988 |  |  |  | 50,696 |  |  |  | 50,899 |  |  |  | 50,574 |
Total investments |  | $ | 765,173 |  |  | $ | 711,116 |  |  | $ | 759,182 |  |  | $ | 709,085 |

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