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Note 4 - Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | December 31, 2023 |  |  | December 31, 2022 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 721,231 |  |  | $ | 670,172 |  |  | $ | 701,074 |  |  | $ | 686,458 |
Warrants |  |  | 16,526 |  |  |  | 24,594 |  |  |  | 14,790 |  |  |  | 29,712 |
Other |  |  | 6,982 |  |  |  | 6,430 |  |  |  | 1,200 |  |  |  | 1,300 |
Equity |  |  | 14,443 |  |  |  | 7,889 |  |  |  | 4,184 |  |  |  | 2,556 |
Total investments |  | $ | 759,182 |  |  | $ | 709,085 |  |  | $ | 721,248 |  |  | $ | 720,026 |
|  | December 31, 2023 |  |  | December 31, 2022 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 145,544 |  |  | $ | 117,781 |  |  | $ | 193,372 |  |  | $ | 195,006 |
Medical Device |  |  | 147,064 |  |  |  | 145,019 |  |  |  | 132,803 |  |  |  | 135,960 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 19,192 |  |  |  | 22,188 |  |  |  | 22,892 |  |  |  | 26,176 |
Consumer-Related |  |  | 105,669 |  |  |  | 101,327 |  |  |  | 121,961 |  |  |  | 114,050 |
Data Storage |  |  | 417 |  |  |  | 418 |  |  |  | 476 |  |  |  | 1,316 |
Internet and Media |  |  | 329 |  |  |  | 1,582 |  |  |  | 329 |  |  |  | 1,159 |
Networking |  |  | 5,451 |  |  |  | 5,297 |  |  |  | 11,831 |  |  |  | 11,710 |
Power Management |  |  | 1,585 |  |  |  | 2,700 |  |  |  | 1,585 |  |  |  | 2,610 |
Semiconductors |  |  | 45 |  |  |  | — |  |  |  | 56 |  |  |  | — |
Software |  |  | 164,133 |  |  |  | 160,749 |  |  |  | 120,157 |  |  |  | 118,716 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency |  |  | 111 |  |  |  | 13 |  |  |  | 8 |  |  |  | 27 |
Other Sustainability |  |  | 98,906 |  |  |  | 80,370 |  |  |  | 84,633 |  |  |  | 85,524 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 19,735 |  |  |  | 19,701 |  |  |  | 9,851 |  |  |  | 9,858 |
Other |  |  | 102 |  |  |  | 1,366 |  |  |  | 7,559 |  |  |  | 3,870 |
Software |  |  | 50,899 |  |  |  | 50,574 |  |  |  | 13,735 |  |  |  | 14,044 |
Total investments |  | $ | 759,182 |  |  | $ | 709,085 |  |  | $ | 721,248 |  |  | $ | 720,026 |

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