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Note 6 - Fair Value - Reconciliation of Level 3 Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Balance | $ 695,465 | $ 706,858
Purchase of investments | 73,689 | 23,319
Warrants and equity received and classified as Level 3 | 165 | 128
Principal payments received on investments | (50,745) | (19,643)
PIK interest on investments | 285 | 1,382
Proceeds from sale of investments | (1) | (41)
Net realized gain on investments | 1 | 21
Unrealized (depreciation) appreciation included in earnings | (31,887) | (2,903)
Other | 425 | 825
Balance | 687,397 | 709,946
Transfer out of debt investments |  | 0
Debt [Member] |  |
Balance | 638,779 | 670,172
Purchase of investments | 71,629 | 22,177
Warrants and equity received and classified as Level 3 | 0 | 0
Principal payments received on investments | (50,745) | (19,080)
PIK interest on investments | 285 | 1,382
Proceeds from sale of investments | (1) | (41)
Net realized gain on investments | 1 | 38
Unrealized (depreciation) appreciation included in earnings | (16,806) | (1,509)
Other | 425 | 825
Balance | 643,567 | 670,773
Transfer out of debt investments |  | (3,191)
Warrant [Member] |  |
Balance | 16,438 | 22,975
Purchase of investments | 0 | 0
Warrants and equity received and classified as Level 3 | 165 | 128
Principal payments received on investments | 0 | 0
PIK interest on investments | 0 | 0
Proceeds from sale of investments | 0 | 0
Net realized gain on investments | 0 | (17)
Unrealized (depreciation) appreciation included in earnings | 556 | 70
Other | 0 | 0
Balance | 17,159 | 23,156
Transfer out of debt investments |  | 0
Equity Securities [Member] |  |
Balance | 25,611 | 7,281
Purchase of investments | 2,045 | 750
Warrants and equity received and classified as Level 3 | 0 | 0
Principal payments received on investments | 0 | 0
PIK interest on investments | 0 | 0
Proceeds from sale of investments | 0 | 0
Net realized gain on investments | 0 | 0
Unrealized (depreciation) appreciation included in earnings | (14,682) | (1,206)
Other | 0 | 0
Balance | 12,974 | 6,825
Transfer out of debt investments |  | 0
Other Investments [Member] |  |
Balance | 14,637 | 6,430
Purchase of investments | 15 | 392
Warrants and equity received and classified as Level 3 | 0 | 0
Principal payments received on investments | 0 | (563)
PIK interest on investments | 0 | 0
Proceeds from sale of investments | 0 | 0
Net realized gain on investments | 0 | 0
Unrealized (depreciation) appreciation included in earnings | (955) | (258)
Other | 0 | 0
Balance | $ 13,697 | 9,192
Transfer out of debt investments |  | $ 3,191

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