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Note 6 - Fair Value - Assets at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Recurring [Member]
Investments, fair value	$ 715,312	$ 720,026
Fair Value, Recurring [Member] | Debt [Member]
Investments, fair value	684,554	686,458
Fair Value, Recurring [Member] | Warrant [Member]
Investments, fair value	25,658	29,712
Fair Value, Recurring [Member] | Other Investments [Member]
Investments, fair value	1,300	1,300
Fair Value, Recurring [Member] | Equity Securities [Member]
Investments, fair value	3,800	2,556
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Investments, fair value	885	140
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Debt [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Warrant [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Other Investments [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Investments, fair value	885	140
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Investments, fair value	1,020	3,567
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Debt [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Warrant [Member]
Investments, fair value	1,020	3,567
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Other Investments [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Investments, fair value	713,407	716,319
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Investments, fair value	713,407	716,319
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Debt [Member]
Investments, fair value	684,554	686,458
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Warrant [Member]
Investments, fair value	24,638	26,145
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Investments [Member]
Investments, fair value	1,300	1,300
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Investments, fair value	$ 2,915	$ 2,416

X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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