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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, 2022	Dec. 31, 2021
Balance	$ 457,557	$ 350,048
Purchase of investments	421,978	344,445
Warrants and equity received and classified as Level 3	5,672	2,681
Principal payments received on investments	(95,871)	188,010
Proceeds from sale of investments	(49,835)	50,690
Net realized (loss) gain on investments	(9,094)	(2,519)
Unrealized (depreciation) appreciation included in earnings	(6,880)	3,885
Transfer out of Level 3	(1,371)	(303)
Transfer out of debt investments	0
Other	(5,837)	(1,980)
Balance	716,319	457,557
Principal payments received on investments	95,871	(188,010)
Proceeds from sale of investments	49,835	(50,690)
Debt [Member]
Balance	437,317	333,495
Purchase of investments	421,372	344,445
Warrants and equity received and classified as Level 3	0	0
Principal payments received on investments	(95,558)	188,010
Proceeds from sale of investments	(49,371)	47,436
Net realized (loss) gain on investments	(8,221)	(5,033)
Unrealized (depreciation) appreciation included in earnings	(10,044)	1,836
Transfer out of Level 3	0	0
Transfer out of debt investments	(3,200)
Other	(5,837)	(1,980)
Balance	686,458	437,317
Principal payments received on investments	95,558	(188,010)
Proceeds from sale of investments	49,371	(47,436)
Warrant [Member]
Balance	19,837	12,736
Purchase of investments	0	0
Warrants and equity received and classified as Level 3	5,664	2,681
Principal payments received on investments	0	0
Proceeds from sale of investments	(464)	3,241
Net realized (loss) gain on investments	264	2,514
Unrealized (depreciation) appreciation included in earnings	2,215	5,218
Transfer out of Level 3	(1,371)	(71)
Transfer out of debt investments	0
Other	0	0
Balance	26,145	19,837
Principal payments received on investments	(0)	0
Proceeds from sale of investments	464	(3,241)
Equity Securities [Member]
Balance	203	2,117
Purchase of investments	606	0
Warrants and equity received and classified as Level 3	8	0
Principal payments received on investments	0	0
Proceeds from sale of investments	0	0
Net realized (loss) gain on investments	0	0
Unrealized (depreciation) appreciation included in earnings	(401)	(1,682)
Transfer out of Level 3	0	(232)
Transfer out of debt investments	2,000
Other	0	0
Balance	2,416	203
Principal payments received on investments	(0)	0
Proceeds from sale of investments	(0)	0
Other Investments [Member]
Balance	200	1,700
Purchase of investments	0	0
Warrants and equity received and classified as Level 3	0	0
Principal payments received on investments	(313)	0
Proceeds from sale of investments	0	13
Net realized (loss) gain on investments	(1,137)	0
Unrealized (depreciation) appreciation included in earnings	1,350	(1,487)
Transfer out of Level 3		0
Transfer out of debt investments	1,200
Other	0	0
Balance	1,300	200
Principal payments received on investments	313	0
Proceeds from sale of investments	$ (0)	$ (13)

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

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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

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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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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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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-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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