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Note 4 - Investments - Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Investments at cost $ 733,232 $ 759,182
Investments at fair value 684,000 709,085
Biotechnology Sector [Member]    
Investments at cost 126,867 145,544
Investments at fair value 106,865 117,781
Medical Device Sector [Member]    
Investments at cost 185,751 147,064
Investments at fair value 179,092 145,019
Communications Sector [Member]    
Investments at cost 13,577 19,192
Investments at fair value 15,596 22,188
Consumer-related Sector [Member]    
Investments at cost 74,381 105,669
Investments at fair value 54,505 101,327
Data Storage Sector [Member]    
Investments at cost 417 417
Investments at fair value 409 418
Internet and Media Sector [Member]    
Investments at cost 329 329
Investments at fair value 984 1,582
Networking Sector [Member]    
Investments at cost 10,064 5,451
Investments at fair value 9,818 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 136,309 164,133
Investments at fair value 132,951 160,749
Energy Efficiency [Member]    
Investments at cost 9,812 111
Investments at fair value 9,712 13
Other Sustainability Sector [Member]    
Investments at cost 66,501 98,906
Investments at fair value 66,163 80,370
Diagnostics Sector [Member]    
Investments at cost 16,692 19,735
Investments at fair value 14,114 19,701
Other Healthcare Sector [Member]    
Investments at cost 39,511 102
Investments at fair value 40,186 1,366
Software, Healthcare Information and Service [Member]    
Investments at cost 51,391 50,899
Investments at fair value 50,905 50,574
Debt [Member]    
Investments at cost 654,127 721,231
Investments at fair value 633,284 670,172
Warrant [Member]    
Investments at cost 17,292 16,526
Investments at fair value 18,735 24,594
Other Debt Obligations [Member]    
Investments at cost 36,651 6,982
Investments at fair value 17,944 6,430
Equity Securities [Member]    
Investments at cost 25,162 14,443
Investments at fair value $ 14,037 $ 7,889