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Note 4 - Investments - Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investments at cost | $ 629,216 | $ 453,837
Investments at fair value | 634,624 | 458,075
Biotechnology Sector [Member] |  |
Investments at cost | 148,952 | 109,899
Investments at fair value | 147,442 | 107,902
Medical Device Sector [Member] |  |
Investments at cost | 114,364 | 88,681
Investments at fair value | 116,967 | 84,567
Communications Sector [Member] |  |
Investments at cost | 22,883 | 22,853
Investments at fair value | 26,070 | 25,920
Consumer-related Sector [Member] |  |
Investments at cost | 109,906 | 92,158
Investments at fair value | 108,301 | 93,194
Data Storage Sector [Member] |  |
Investments at cost | 476 | 476
Investments at fair value | 1,211 | 1,047
Internet and Media Sector [Member] |  |
Investments at cost | 329 | 569
Investments at fair value | 1,299 | 3,305
Networking Sector [Member] |  |
Investments at cost | 13,551 | 17,390
Investments at fair value | 13,413 | 17,964
Power Management Sector [Member] |  |
Investments at cost | 1,585 | 1,585
Investments at fair value | 2,254 | 2,609
Semiconductor Sector [Member] |  |
Investments at cost | 56 | 101
Investments at fair value | 0 | 0
Software Sector [Member] |  |
Investments at cost | 108,910 | 60,902
Investments at fair value | 107,441 | 60,807
Other Sustainability Sector [Member] |  |
Investments at cost | 77,024 | 46,595
Investments at fair value | 77,700 | 47,011
Diagnostics Sector [Member] |  |
Investments at cost | 9,840 | 12,393
Investments at fair value | 9,844 | 12,377
Other Sector [Member] |  |
Investments at cost | 7,621 | 175
Investments at fair value | 8,682 | 1,177
Software, Healthcare Information and Service [Member] |  |
Investments at cost | 13,719 | 60
Investments at fair value | 14,000 | 195
Debt [Member] |  |
Investments at cost | 612,478 | 441,885
Investments at fair value | 609,032 | 437,317
Warrant [Member] |  |
Investments at cost | 11,971 | 10,023
Investments at fair value | 22,113 | 20,200
Other Debt Obligations [Member] |  |
Investments at cost | 1,200 | 1,450
Investments at fair value | 1,300 | 200
Equity Securities [Member] |  |
Investments at cost | 3,567 | 479
Investments at fair value | $ 2,179 | $ 358

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