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Note 4 - Investments (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | June 30, 2023 |  |  | December 31, 2022 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 700,162 |  |  | $ | 683,309 |  |  | $ | 701,074 |  |  | $ | 686,458 |
Warrants |  |  | 15,061 |  |  |  | 25,483 |  |  |  | 14,790 |  |  |  | 29,712 |
Other |  |  | 1,200 |  |  |  | 1,300 |  |  |  | 1,200 |  |  |  | 1,300 |
Equity |  |  | 7,210 |  |  |  | 5,299 |  |  |  | 4,184 |  |  |  | 2,556 |
Total investments |  | $ | 723,633 |  |  | $ | 715,391 |  |  | $ | 721,248 |  |  | $ | 720,026 |
|  | June 30, 2023 |  |  | December 31, 2022 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 182,489 |  |  | $ | 174,598 |  |  | $ | 193,372 |  |  | $ | 195,006 |
Medical Device |  |  | 128,203 |  |  |  | 130,634 |  |  |  | 132,803 |  |  |  | 135,960 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 22,922 |  |  |  | 26,170 |  |  |  | 22,892 |  |  |  | 26,176 |
Consumer-Related |  |  | 113,903 |  |  |  | 108,275 |  |  |  | 121,961 |  |  |  | 114,050 |
Data Storage |  |  | 417 |  |  |  | 1,060 |  |  |  | 476 |  |  |  | 1,316 |
Internet and Media |  |  | 329 |  |  |  | 1,634 |  |  |  | 329 |  |  |  | 1,159 |
Networking |  |  | 8,391 |  |  |  | 8,274 |  |  |  | 11,831 |  |  |  | 11,710 |
Power Management |  |  | 1,585 |  |  |  | 2,898 |  |  |  | 1,585 |  |  |  | 2,610 |
Semiconductors |  |  | 57 |  |  |  | — |  |  |  | 56 |  |  |  | — |
Software |  |  | 142,853 |  |  |  | 139,934 |  |  |  | 120,157 |  |  |  | 118,716 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency |  |  | 111 |  |  |  | 97 |  |  |  | 8 |  |  |  | 27 |
Other Sustainability |  |  | 86,095 |  |  |  | 83,942 |  |  |  | 84,633 |  |  |  | 85,524 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 9,960 |  |  |  | 9,969 |  |  |  | 9,851 |  |  |  | 9,858 |
Other |  |  | 101 |  |  |  | 1,374 |  |  |  | 7,559 |  |  |  | 3,870 |
Software |  |  | 26,217 |  |  |  | 26,532 |  |  |  | 13,735 |  |  |  | 14,044 |
Total investments |  | $ | 723,633 |  |  | $ | 715,391 |  |  | $ | 721,248 |  |  | $ | 720,026 |

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