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Note 4 - Investments - Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investments at cost $ 765,173 $ 759,182
Investments at fair value 711,116 709,085
Biotechnology Sector [Member]    
Investments at cost 142,108 145,544
Investments at fair value 124,741 117,781
Medical Device Sector [Member]    
Investments at cost 164,060 147,064
Investments at fair value 161,155 145,019
Communications Sector [Member]    
Investments at cost 17,327 19,192
Investments at fair value 20,185 22,188
Consumer-related Sector [Member]    
Investments at cost 105,165 105,669
Investments at fair value 99,876 101,327
Data Storage Sector [Member]    
Investments at cost 416 417
Investments at fair value 426 418
Internet and Media Sector [Member]    
Investments at cost 328 329
Investments at fair value 1,592 1,582
Networking Sector [Member]    
Investments at cost 3,231 5,451
Investments at fair value 3,091 5,297
Power Management Sector [Member]    
Investments at cost 1,585 1,585
Investments at fair value 2,700 2,700
Semiconductor Sector [Member]    
Investments at cost 45 45
Investments at fair value 0 0
Software Sector [Member]    
Investments at cost 159,094 164,133
Investments at fair value 154,908 160,749
Energy Efficiency [Member]    
Investments at cost 111 111
Investments at fair value 8 13
Other Sustainability Sector [Member]    
Investments at cost 100,854 98,906
Investments at fair value 71,060 80,370
Diagnostics Sector [Member]    
Investments at cost 19,759 19,735
Investments at fair value 19,729 19,701
Other Healthcare Sector [Member]    
Investments at cost 102 102
Investments at fair value 949 1,366
Software, Healthcare Information and Service [Member]    
Investments at cost 50,988 50,899
Investments at fair value 50,696 50,574
Debt [Member]    
Investments at cost 719,500 721,231
Investments at fair value 670,773 670,172
Warrant [Member]    
Investments at cost 16,636 16,526
Investments at fair value 23,928 24,594
Other Debt Obligations [Member]    
Investments at cost 13,844 6,982
Investments at fair value 9,192 6,430
Equity Securities [Member]    
Investments at cost 15,193 14,443
Investments at fair value $ 7,223 $ 7,889