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Note 4 - Investments - Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investments at cost	$ 725,430	$ 759,182
Investments at fair value	646,862	709,085
Biotechnology Sector [Member]
Investments at cost	133,486	145,544
Investments at fair value	118,846	117,781
Medical Device Sector [Member]
Investments at cost	163,383	147,064
Investments at fair value	149,839	145,019
Communications Sector [Member]
Investments at cost	15,462	19,192
Investments at fair value	18,263	22,188
Consumer-related Sector [Member]
Investments at cost	78,244	105,669
Investments at fair value	59,113	101,327
Data Storage Sector [Member]
Investments at cost	417	417
Investments at fair value	428	418
Internet and Media Sector [Member]
Investments at cost	329	329
Investments at fair value	1,203	1,582
Networking Sector [Member]
Investments at cost	1,511	5,451
Investments at fair value	1,309	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	163,033	164,133
Investments at fair value	159,279	160,749
Energy Efficiency [Member]
Investments at cost	111	111
Investments at fair value	10	13
Other Sustainability Sector [Member]
Investments at cost	100,274	98,906
Investments at fair value	69,809	80,370
Diagnostics Sector [Member]
Investments at cost	16,210	19,735
Investments at fair value	14,281	19,701
Other Healthcare Sector [Member]
Investments at cost	102	102
Investments at fair value	979	1,366
Software, Healthcare Information and Service [Member]
Investments at cost	51,238	50,899
Investments at fair value	50,803	50,574
Debt [Member]
Investments at cost	675,295	721,231
Investments at fair value	609,068	670,172
Warrant [Member]
Investments at cost	17,463	16,526
Investments at fair value	21,459	24,594
Other Debt Obligations [Member]
Investments at cost	14,298	6,982
Investments at fair value	9,183	6,430
Equity Securities [Member]
Investments at cost	18,374	14,443
Investments at fair value	$ 7,152	$ 7,889

X

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Cost of the investment.

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