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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
	Mar. 31, 2023	Mar. 31, 2022
Balance	$ 716,319	$ 457,557
Purchase of investments	47,008	94,485
Warrants received and classified as Level 3	141	808
Principal payments received on investments	(39,756)	14,145
Payment-in-kind interest on investments	1,204
Proceeds from sale of investments	(6,520)	21,280
Net realized gain (loss) on investments	(134)	30
Unrealized (depreciation) appreciation included in earnings	(5,867)	(2,120)
Transfer out of debt investments	0
Other	1,012	(1,093)
Balance	713,407	514,242
Principal payments received on investments	39,756	(14,145)
Proceeds from sale of investments	6,520	(21,280)
Debt [Member]
Balance	686,458	437,317
Purchase of investments	46,998	94,485
Warrants received and classified as Level 3	0	0
Principal payments received on investments	(39,756)	14,095
Payment-in-kind interest on investments	1,204
Proceeds from sale of investments	(6,508)	21,250
Net realized gain (loss) on investments	7	0
Unrealized (depreciation) appreciation included in earnings	(4,566)	(3,170)
Transfer out of debt investments	(295)
Other	1,012	(1,093)
Balance	684,554	492,194
Principal payments received on investments	39,756	(14,095)
Proceeds from sale of investments	6,508	(21,250)
Warrant [Member]
Balance	26,145	19,837
Purchase of investments	0	0
Warrants received and classified as Level 3	141	808
Principal payments received on investments	0	0
Payment-in-kind interest on investments	0
Proceeds from sale of investments	(12)	30
Net realized gain (loss) on investments	(141)	30
Unrealized (depreciation) appreciation included in earnings	(1,490)	1,000
Transfer out of debt investments	(5)
Other	0	0
Balance	24,638	21,645
Principal payments received on investments	(0)	0
Proceeds from sale of investments	12	(30)
Equity Securities [Member]
Balance	2,416	203
Purchase of investments	10	0
Warrants received and classified as Level 3	0	0
Principal payments received on investments	0	0
Payment-in-kind interest on investments	0
Proceeds from sale of investments	0	0
Net realized gain (loss) on investments	0	0
Unrealized (depreciation) appreciation included in earnings	189	0
Transfer out of debt investments	300
Other	0	0
Balance	2,915	203
Principal payments received on investments	(0)	0
Proceeds from sale of investments	(0)	0
Other Investments [Member]
Balance	1,300	200
Purchase of investments	0	0
Warrants received and classified as Level 3	0	0
Principal payments received on investments	0	50
Payment-in-kind interest on investments	0
Proceeds from sale of investments	0	0
Net realized gain (loss) on investments	0	0
Unrealized (depreciation) appreciation included in earnings	0	50
Transfer out of debt investments	0
Other	0	0
Balance	1,300	200
Principal payments received on investments	(0)	(50)
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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- Definition

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

+ References

No definition available.

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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

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-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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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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