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Note 7 - Borrowings - Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Oct. 17, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Nov. 09, 2022 | Jun. 15, 2022 | Dec. 31, 2021 | Mar. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total commitment |  | $ 716,078 |  | $ 615,000 |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [1] | 472,078 |  | 466,000 | $ 439,323 |  |  | $ 260,250 |  | $ 187,625 | $ 154,375 | $ 127,875 | $ 95,375 | $ 96,000 | $ 115,546
Unused commitment |  | 244,000 |  | 149,000 |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs attributable to term borrowings |  | (4,174) |  | (3,765) |  |  |  |  |  |  |  |  |  |  |
Total borrowings outstanding, net |  | 467,904 |  | 462,235 |  |  |  |  |  |  |  |  |  |  |
Key Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment |  | 150,000 |  | 150,000 |  |  |  |  |  |  |  |  |  |  |
Balance outstanding |  | 0 |  | 70,000 |  |  |  |  |  |  |  |  |  |  |
Unused commitment |  | 150,000 |  | 80,000 |  |  |  |  |  |  |  |  |  |  |
NYL Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment |  | 250,000 |  | 250,000 |  |  |  |  |  |  |  |  |  |  |
Balance outstanding |  | 181,000 |  | 181,000 |  |  |  |  |  |  |  |  |  |  |
Unused commitment |  | 69,000 |  | 69,000 |  |  |  |  |  |  |  |  |  |  |
Nuveen Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment |  | 100,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Balance outstanding |  | 75,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Unused commitment |  | 25,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Asset-backed Notes 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment |  | 81,078 |  | 100,000 |  | $ 157,800 |  |  |  |  |  |  |  |  |
Balance outstanding |  | 81,078 |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Unused commitment |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
The 2027 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment |  | 57,500 |  | 57,500 |  |  | $ 50,000 |  |  |  |  |  |  |  |
Balance outstanding | [2] | 57,500 |  | 57,500 | 57,500 |  |  | 0 |  | 0 | 0 | 0 | 0 | 0 | 0
Unused commitment |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
The 2026 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment |  | 57,500 |  | 57,500 |  |  |  |  | $ 57,500 |  |  |  |  |  |
Balance outstanding | [2] | 57,500 |  | 57,500 | 57,500 |  |  | 57,500 |  | 0 | 0 | 0 | 0 | 0 | 0
Unused commitment |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
The 2031 Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment |  | 20,000 | $ 20,000 | 0 |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [2] | 20,000 |  | 0 | $ 0 |  |  | $ 0 |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Unused commitment |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
[1] | Total amount of senior securities outstanding at the end of the period presented.
[2] | Total amount of senior securities outstanding at the end of the period presented.

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