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Note 4 - Investments (Tables) | 6 Months Ended
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Jun. 30, 2026
Notes Tables |
Investment Holdings, Schedule of Investments [Table Text Block] |
|  | June 30, 2026 |  |  | December 31, 2025 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 682,425 |  |  | $ | 647,999 |  |  | $ | 602,488 |  |  | $ | 596,025 |
Warrants |  |  | 15,155 |  |  |  | 16,703 |  |  |  | 14,868 |  |  |  | 16,648 |
Other |  |  | 37,962 |  |  |  | 4,037 |  |  |  | 45,258 |  |  |  | 3,444 |
Equity |  |  | 42,110 |  |  |  | 7,757 |  |  |  | 42,655 |  |  |  | 31,127 |
Equity interest in RoHo Joint Venture |  |  | 215 |  |  |  | 215 |  |  |  | — |  |  |  | — |
Total investments |  | $ | 777,867 |  |  | $ | 676,711 |  |  | $ | 705,269 |  |  | $ | 647,244 |
|  | June 30, 2026 |  |  | December 31, 2025 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
|  | (In thousands) |
Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biotechnology |  | $ | 117,812 |  |  | $ | 86,231 |  |  | $ | 94,280 |  |  | $ | 61,829 |
Medical Device |  |  | 230,456 |  |  |  | 232,913 |  |  |  | 227,893 |  |  |  | 222,485 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications |  |  | 6,286 |  |  |  | 7,459 |  |  |  | 522 |  |  |  | 3,142 |
Consumer-Related |  |  | 30,840 |  |  |  | 19,800 |  |  |  | 31,204 |  |  |  | 21,846 |
Data Storage |  |  | 417 |  |  |  | 197 |  |  |  | 417 |  |  |  | 230 |
Internet and Media |  |  | 329 |  |  |  | 78 |  |  |  | 329 |  |  |  | 151 |
Networking |  |  | 364 |  |  |  | — |  |  |  | 364 |  |  |  | — |
Software |  |  | 237,700 |  |  |  | 228,691 |  |  |  | 199,608 |  |  |  | 190,911 |
Sustainability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative Energy |  |  | — |  |  |  | — |  |  |  | 4,914 |  |  |  | 4,905 |
Energy Efficiency |  |  | 125 |  |  |  | 15 |  |  |  | 125 |  |  |  | 9 |
Other Sustainability |  |  | 57,406 |  |  |  | 18,223 |  |  |  | 50,321 |  |  |  | 49,315 |
Healthcare Information and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diagnostics |  |  | 12,001 |  |  |  | 10,560 |  |  |  | 11,553 |  |  |  | 11,369 |
Other |  |  | 38,889 |  |  |  | 30,041 |  |  |  | 38,668 |  |  |  | 34,508 |
Software |  |  | 45,027 |  |  |  | 42,288 |  |  |  | 45,071 |  |  |  | 46,544 |
Investment funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RoHo Capital Opportunity Fund LLC |  |  | 215 |  |  |  | 215 |  |  |  | — |  |  |  | — |
Total investments |  | $ | 777,867 |  |  | $ | 676,711 |  |  | $ | 705,269 |  |  | $ | 647,244 |
Investment Company, Nonconsolidated Subsidiary, Summarized Financial Information [Table Text Block] |
|  | June 30, |
|  | 2026 |
Assets |  |  |  |
Investments in money market funds |  |  | 200 |
Contributions receivable |  |  | 430 |
Total assets |  | $ | 630 |
Liabilities |  |  |  |
Other liabilities |  |  | 630 |
Total liabilities |  |  | 630 |
Commitments and contingencies |  |  |  |
Members’ Capital |  |  |  |
Members’ capital |  |  | — |
Total members’ capital |  |  | — |
Total liabilities and members’ capital |  | $ | 630 |
|  | For the three months |  |  | For the period March 18, |
|  | ended |  |  | 2026 through |
|  | June 30, 2026 |
|  | (In thousands) |
Selected Statements of Operations Information |  |  |  |  |  |  |  |
Total investment income |  | $ | — |  |  | $ | — |
Total expenses |  | $ | 430 |  |  | $ | 430 |
Net investment income |  | $ | (430 | ) |  | $ | (430 | )
Net decrease in net assets resulting from operations |  | $ | (430 | ) |  | $ | (430 | )

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