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Note 6 - Fair Value - Reconciliation of Level 3 Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Balance	$ 713,244	$ 577,380	$ 716,319	$ 457,557
Purchase of investments	66,935	94,627	154,488	348,347
Warrants received and classified as Level 3	1,294	964	2,039	2,441
Principal payments received on investments	(25,726)	26,960	(90,222)	114,433
Payment-in-kind interest on investments	3,934		6,088
Proceeds from sale of investments	(2,557)	6,126	(11,063)	49,552
Net realized (loss) gain on investments	(11,552)	(8,195)	(28,198)	(9,094)
Unrealized (depreciation) appreciation included in earnings	(20,722)	4,227	(26,384)	2,720
Transfer out of Level 3	(5,000)	(1,117)	(5,111)	(1,117)
Transfer out of debt investments	0	0	0	0
Other	(715)	(541)	1,179	(2,610)
Balance	719,135	634,259	719,135	634,259
Principal payments received on investments	25,726	(26,960)	90,222	(114,433)
Proceeds from sale of investments	2,557	(6,126)	11,063	(49,552)
Debt [Member]
Balance	683,309	551,560	686,458	437,317
Purchase of investments	66,185	94,627	153,728	348,097
Warrants received and classified as Level 3	0	0	0	0
Principal payments received on investments	(25,726)	26,929	(90,222)	114,120
Payment-in-kind interest on investments	3,934		6,088
Proceeds from sale of investments	(2,528)	6,088	(9,564)	49,088
Net realized (loss) gain on investments	(11,440)	(8,492)	(29,105)	(8,492)
Unrealized (depreciation) appreciation included in earnings	(18,877)	8,095	(21,325)	1,128
Transfer out of Level 3	(5,000)	0	(5,000)	0
Transfer out of debt investments	(9,304)	(3,200)	(12,399)	(3,200)
Other	(715)	(541)	1,179	(2,610)
Balance	679,838	609,032	679,838	609,032
Principal payments received on investments	25,726	(26,929)	90,222	(114,120)
Proceeds from sale of investments	2,528	(6,088)	9,564	(49,088)
Warrant [Member]
Balance	24,376	25,167	26,145	19,837
Purchase of investments	0	0	0	0
Warrants received and classified as Level 3	1,294	964	1,950	2,441
Principal payments received on investments	0	0	0	0
Payment-in-kind interest on investments	0		0
Proceeds from sale of investments	(23)	38	(1,493)	464
Net realized (loss) gain on investments	(118)	266	1,028	535
Unrealized (depreciation) appreciation included in earnings	(296)	(3,348)	(2,392)	662
Transfer out of Level 3	0	(1,117)	0	(1,117)
Transfer out of debt investments	0	0	(5)	0
Other	0	0	0	0
Balance	25,233	21,894	25,233	21,894
Principal payments received on investments	(0)	0	(0)	0
Proceeds from sale of investments	23	(38)	1,493	(464)
Equity Securities [Member]
Balance	4,259	453	2,416	203
Purchase of investments	750	0	760	250
Warrants received and classified as Level 3	0	0	89	0
Principal payments received on investments	0	0	0	0
Payment-in-kind interest on investments	0		0
Proceeds from sale of investments	(6)	0	(6)	0
Net realized (loss) gain on investments	6	0	(121)	0
Unrealized (depreciation) appreciation included in earnings	(1,349)	(420)	(2,467)	(420)
Transfer out of Level 3	0	0	(111)	0
Transfer out of debt investments	3,150	2,000	6,250	2,000
Other	0	0	0	0
Balance	6,810	2,033	6,810	2,033
Principal payments received on investments	(0)	0	(0)	0
Proceeds from sale of investments	6	0	6	0
Other Investments [Member]
Balance	1,300	200	1,300	200
Purchase of investments	0	0	0	0
Warrants received and classified as Level 3	0	0	0	0
Principal payments received on investments	0	31	0	313
Payment-in-kind interest on investments	0		0
Proceeds from sale of investments	0	0	0	0
Net realized (loss) gain on investments	0	31	0	(1,137)
Unrealized (depreciation) appreciation included in earnings	(200)	(100)	(200)	1,350
Transfer out of Level 3	0	0	0	0
Transfer out of debt investments	6,154	1,200	6,154	1,200
Other	0	0	0	0
Balance	7,254	1,300	7,254	1,300
Principal payments received on investments	(0)	(31)	(0)	(313)
Proceeds from sale of investments	$ (0)	$ 0	$ (0)	$ 0

X

- Definition

Amount of unrealized appreciation (depreciation) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of payment in-king interest on financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of received warrants and equity received of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
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-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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+ References

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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