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Note 12 - Subsequent Events (Details Textual) - USD ($) $ in Thousands | Jul. 30, 2024 | Jul. 12, 2024 | Jul. 11, 2024 | Jul. 10, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Investment Owned, Fair Value |  |  |  |  | $ 646,862 | $ 709,085
MyForest Foods Co [Member] | Debt Securities [Member] | Subsequent Event [Member] |  |  |  |  |  |
Proceeds from Sale, Maturity and Collection of Investments |  |  |  | $ 3,800 |  |
Lemongrass Holdings, Inc [Member] | Debt Securities [Member] | Subsequent Event [Member] |  |  |  |  |  |
Proceeds from Sale, Maturity and Collection of Investments |  |  | $ 6,300 |  |  |
Slingshot Aerospace, Inc. [Member] | Debt Securities [Member] | Subsequent Event [Member] |  |  |  |  |  |
Proceeds from Sale, Maturity and Collection of Investments |  | $ 20,000 |  |  |  |
Nexii Building Solutions, Inc [Member] | Debt Securities [Member] |  |  |  |  |  |
Investment Owned, Fair Value |  |  |  |  | $ 10,900 |
Hometeam Technologies, Inc [Member] | Debt Securities [Member] | Subsequent Event [Member] |  |  |  |  |  |
Payments to Acquire Investments | $ 25,000 |  |  |  |  |

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