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Note 6 - Fair Value - Assets at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Recurring [Member] |  |
Investments, fair value | $ 622,653 | $ 697,891
Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 579,171 | 638,779
Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 21,629 | 18,277
Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 8,451 | 14,637
Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | 13,402 | 26,198
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 490 | 587
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 | 490 | 587
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 1,173 | 1,839
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 | 1,173 | 1,839
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 | 620,990 | 695,465
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 620,990 | 695,465
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 579,171 | 638,779
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 20,456 | 16,438
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 8,451 | 14,637
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | $ 12,912 | $ 25,611

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