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Note 6 - Fair Value - Reconciliation of Level 3 Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 716,319	$ 457,557
Purchase of investments	218,689	421,978
Warrants and equity received and classified as Level 3	2,852	5,672
Principal payments received on investments	(152,293)	95,871
Payment-in-kind interest on investments	8,433
Proceeds from sale of investments	(11,066)	49,835
Net realized (loss) gain on investments	(28,264)	(9,094)
Unrealized (depreciation) appreciation included in earnings	(44,148)	(6,880)
Transfer out of Level 3	(5,111)	(1,371)
Transfer out of debt and warrant investments	0	0
Other	1,447	(5,837)
Balance	706,858	716,319
Principal payments received on investments	152,293	(95,871)
Proceeds from sale of investments	11,066	(49,835)
Debt [Member]
Balance	686,458	437,317
Purchase of investments	217,285	421,372
Warrants and equity received and classified as Level 3	0	0
Principal payments received on investments	(151,777)	95,558
Payment-in-kind interest on investments	8,433
Proceeds from sale of investments	(9,565)	49,371
Net realized (loss) gain on investments	(29,146)	(8,221)
Unrealized (depreciation) appreciation included in earnings	(35,564)	(10,044)
Transfer out of Level 3	(5,000)	0
Transfer out of debt and warrant investments	(12,399)	(3,200)
Other	1,447	(5,837)
Balance	670,172	686,458
Principal payments received on investments	151,777	(95,558)
Proceeds from sale of investments	9,565	(49,371)
Warrant [Member]
Balance	26,145	19,837
Purchase of investments	0	0
Warrants and equity received and classified as Level 3	2,763	5,664
Principal payments received on investments	0	0
Payment-in-kind interest on investments	0
Proceeds from sale of investments	(1,495)	464
Net realized (loss) gain on investments	1,003	264
Unrealized (depreciation) appreciation included in earnings	(5,436)	2,215
Transfer out of Level 3	0	(1,371)
Transfer out of debt and warrant investments	(5)	0
Other	0	0
Balance	22,975	26,145
Principal payments received on investments	(0)	0
Proceeds from sale of investments	1,495	(464)
Equity Securities [Member]
Balance	2,416	203
Purchase of investments	1,260	606
Warrants and equity received and classified as Level 3	89	8
Principal payments received on investments	0	0
Payment-in-kind interest on investments	0
Proceeds from sale of investments	(6)	0
Net realized (loss) gain on investments	(121)	0
Unrealized (depreciation) appreciation included in earnings	(2,496)	(401)
Transfer out of Level 3	(111)	0
Transfer out of debt and warrant investments	6,250	2,000
Other	0	0
Balance	7,281	2,416
Principal payments received on investments	(0)	0
Proceeds from sale of investments	6	0
Other Investments [Member]
Balance	1,300	200
Purchase of investments	144	0
Warrants and equity received and classified as Level 3	0	0
Principal payments received on investments	(516)	313
Payment-in-kind interest on investments	0
Proceeds from sale of investments	0	0
Net realized (loss) gain on investments	0	(1,137)
Unrealized (depreciation) appreciation included in earnings	(652)	1,350
Transfer out of Level 3	0	0
Transfer out of debt and warrant investments	6,154	1,200
Other	0	0
Balance	6,430	1,300
Principal payments received on investments	516	(313)
Proceeds from sale of investments	$ (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).

+ References

No definition available.

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- Definition

Amount of other increase (decrease) 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

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of realized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

No definition available.

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Amount of transfer of financial instrument classified as an asset between investments.

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- Definition

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

No definition available.

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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
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of sale 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
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Amount of settlement 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
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

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

+ References

No definition available.

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- Definition

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.

+ References

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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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