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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, 2025	Mar. 31, 2024
Balance	$ 695,465	$ 706,858
Purchase of investments	73,689	23,319
Warrants and equity received and classified as Level 3	165	128
Principal payments received on investments	(50,745)	(19,643)
PIK interest on investments	285	1,382
Proceeds from sale of investments	(1)	(41)
Net realized gain on investments	1	21
Unrealized (depreciation) appreciation included in earnings	(31,887)	(2,903)
Other	425	825
Balance	687,397	709,946
Transfer out of debt investments		0
Debt [Member]
Balance	638,779	670,172
Purchase of investments	71,629	22,177
Warrants and equity received and classified as Level 3	0	0
Principal payments received on investments	(50,745)	(19,080)
PIK interest on investments	285	1,382
Proceeds from sale of investments	(1)	(41)
Net realized gain on investments	1	38
Unrealized (depreciation) appreciation included in earnings	(16,806)	(1,509)
Other	425	825
Balance	643,567	670,773
Transfer out of debt investments		(3,191)
Warrant [Member]
Balance	16,438	22,975
Purchase of investments	0	0
Warrants and equity received and classified as Level 3	165	128
Principal payments received on investments	0	0
PIK interest on investments	0	0
Proceeds from sale of investments	0	0
Net realized gain on investments	0	(17)
Unrealized (depreciation) appreciation included in earnings	556	70
Other	0	0
Balance	17,159	23,156
Transfer out of debt investments		0
Equity Securities [Member]
Balance	25,611	7,281
Purchase of investments	2,045	750
Warrants and equity received and classified as Level 3	0	0
Principal payments received on investments	0	0
PIK interest on investments	0	0
Proceeds from sale of investments	0	0
Net realized gain on investments	0	0
Unrealized (depreciation) appreciation included in earnings	(14,682)	(1,206)
Other	0	0
Balance	12,974	6,825
Transfer out of debt investments		0
Other Investments [Member]
Balance	14,637	6,430
Purchase of investments	15	392
Warrants and equity received and classified as Level 3	0	0
Principal payments received on investments	0	(563)
PIK interest on investments	0	0
Proceeds from sale of investments	0	0
Net realized gain on investments	0	0
Unrealized (depreciation) appreciation included in earnings	(955)	(258)
Other	0	0
Balance	$ 13,697	9,192
Transfer out of debt investments		$ 3,191

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 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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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.

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