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Note 6 - Fair Value - Assets at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Recurring [Member] |  |
Investments, fair value | $ 729,053 | $ 720,026
Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 679,838 | 686,458
Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 26,189 | 29,712
Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 7,254 | 1,300
Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | 15,772 | 2,556
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 8,962 | 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 | 8,962 | 140
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 956 | 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 | 956 | 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 | 719,135 | 716,319
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 719,135 | 716,319
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 679,838 | 686,458
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 25,233 | 26,145
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 7,254 | 1,300
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | $ 6,810 | $ 2,416

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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/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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