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Note 6 - Fair Value - Assets at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Recurring [Member]
Investments, fair value	$ 646,862	$ 709,085
Fair Value, Recurring [Member] | Debt [Member]
Investments, fair value	609,068	670,172
Fair Value, Recurring [Member] | Warrant [Member]
Investments, fair value	21,459	24,594
Fair Value, Recurring [Member] | Other Investments [Member]
Investments, fair value	9,183	6,430
Fair Value, Recurring [Member] | Equity Securities [Member]
Investments, fair value	7,152	7,889
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Investments, fair value	302	608
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	302	608
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Investments, fair value	328	1,619
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	328	1,619
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	646,232	706,858
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Investments, fair value	646,232	706,858
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Debt [Member]
Investments, fair value	609,068	670,172
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Warrant [Member]
Investments, fair value	21,131	22,975
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Investments [Member]
Investments, fair value	9,183	6,430
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Investments, fair value	$ 6,850	$ 7,281

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/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-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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