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Note 4 - Investments - Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investments at cost $ 754,814 $ 721,248
Investments at fair value 729,053 720,026
Biotechnology Sector [Member]    
Investments at cost 158,953 193,372
Investments at fair value 139,935 195,006
Medical Device Sector [Member]    
Investments at cost 140,172 132,803
Investments at fair value 139,039 135,960
Communications Sector [Member]    
Investments at cost 21,057 22,892
Investments at fair value 24,317 26,176
Consumer-related Sector [Member]    
Investments at cost 110,245 121,961
Investments at fair value 106,559 114,050
Data Storage Sector [Member]    
Investments at cost 417 476
Investments at fair value 1,070 1,316
Internet and Media Sector [Member]    
Investments at cost 329 329
Investments at fair value 1,615 1,159
Networking Sector [Member]    
Investments at cost 6,671 11,831
Investments at fair value 6,558 11,710
Power Management Sector [Member]    
Investments at cost 1,585 1,585
Investments at fair value 2,901 2,610
Semiconductor Sector [Member]    
Investments at cost 56 56
Investments at fair value 0 0
Software Sector [Member]    
Investments at cost 164,903 120,157
Investments at fair value 161,258 118,716
Energy Efficiency [Member]    
Investments at cost 111 8
Investments at fair value 36 27
Other Sustainability Sector [Member]    
Investments at cost 89,395 84,633
Investments at fair value 83,476 85,524
Diagnostics Sector [Member]    
Investments at cost 9,971 9,851
Investments at fair value 9,939 9,858
Other Healthcare Sector [Member]    
Investments at cost 102 7,559
Investments at fair value 1,379 3,870
Software, Healthcare Information and Service [Member]    
Investments at cost 50,847 13,735
Investments at fair value 50,971 14,044
Debt [Member]    
Investments at cost 716,655 701,074
Investments at fair value 679,838 686,458
Warrant [Member]    
Investments at cost 15,783 14,790
Investments at fair value 26,189 29,712
Other Debt Obligations [Member]    
Investments at cost 7,354 1,200
Investments at fair value 7,254 1,300
Equity Securities [Member]    
Investments at cost 15,022 4,184
Investments at fair value $ 15,772 $ 2,556