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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

X

- Definition

Cost of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 946
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-Section 50
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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