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Note 6 - Fair Value - Assets at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Recurring [Member] |  |
Investments, fair value | $ 684,000 | $ 709,085
Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 633,284 | 670,172
Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 18,735 | 24,594
Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 17,944 | 6,430
Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | 14,037 | 7,889
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 560 | 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 | 560 | 608
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 430 | 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 | 430 | 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 | 683,010 | 706,858
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 683,010 | 706,858
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 633,284 | 670,172
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 18,305 | 22,975
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 17,944 | 6,430
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | $ 13,477 | $ 7,281

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- 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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