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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Balance | $ 687,397 | $ 709,946 | $ 695,465 | $ 706,858
Purchase of investments | 42,369 | 12,065 | 116,058 | 35,384
Warrants and equity received and classified as Level 3 | 117 | 1,089 | 282 | 1,217
Principal payments received on investments | (78,493) | (56,413) | (129,238) | (76,056)
PIK interest on investments | 243 | 355 | 528 | 1,737
Proceeds from sale of investments | (783) | (47) | (784) | (88)
Net realized (loss) gain on investments | (9,294) | 2,660 | (9,293) | 2,681
Unrealized (depreciation) appreciation included in earnings | (21,658) | (24,165) | (53,545) | (27,068)
Transfer out of debt investments | 0 | 0 | 0 | 0
Other | 1,092 | 742 | 1,517 | 1,567
Balance | 620,990 | 646,232 | 620,990 | 646,232
Debt [Member] |  |  |  |
Balance | 643,567 | 670,773 | 638,779 | 670,172
Purchase of investments | 42,225 | 11,605 | 113,854 | 33,782
Warrants and equity received and classified as Level 3 | 0 | 0 | 0 | 0
Principal payments received on investments | (78,493) | (56,906) | (129,238) | (75,986)
PIK interest on investments | 243 | 355 | 528 | 1,737
Proceeds from sale of investments | (1) | (3) | (2) | (44)
Net realized (loss) gain on investments | (9,364) | 3 | (9,363) | 41
Unrealized (depreciation) appreciation included in earnings | (18,005) | (17,501) | (34,811) | (19,010)
Transfer out of debt investments | (2,093) | 0 | (2,093) | (3,191)
Other | 1,092 | 742 | 1,517 | 1,567
Balance | 579,171 | 609,068 | 579,171 | 609,068
Warrant [Member] |  |  |  |
Balance | 17,159 | 23,156 | 16,438 | 22,975
Purchase of investments | 0 | 0 | 0 | 0
Warrants and equity received and classified as Level 3 | 117 | 1,089 | 282 | 1,217
Principal payments received on investments | 0 | 0 | 0 | 0
PIK interest on investments | 0 | 0 | 0 | 0
Proceeds from sale of investments | (579) | (4) | (579) | (4)
Net realized (loss) gain on investments | (99) | 2,617 | (99) | 2,600
Unrealized (depreciation) appreciation included in earnings | 3,858 | (3,046) | 4,414 | (2,976)
Transfer out of debt investments | 0 | (2,681) | 0 | (2,681)
Other | 0 | 0 | 0 |
Balance | 20,456 | 21,131 | 20,456 | 21,131
Equity Securities [Member] |  |  |  |
Balance | 12,974 | 6,825 | 25,611 | 7,281
Purchase of investments | 144 | 500 | 2,189 | 1,250
Warrants and equity received and classified as Level 3 | 0 | 0 | 0 | 0
Principal payments received on investments | 0 | 0 | 0 | 0
PIK interest on investments | 0 | 0 | 0 | 0
Proceeds from sale of investments | (203) | 0 | (203) | 0
Net realized (loss) gain on investments | 169 | 0 | 169 | 0
Unrealized (depreciation) appreciation included in earnings | (172) | (3,156) | (14,854) | (4,362)
Transfer out of debt investments | 0 | 2,681 | 0 | 2,681
Other | 0 | 0 | 0 | 0
Balance | 12,912 | 6,850 | 12,912 | 6,850
Other Investments [Member] |  |  |  |
Balance | 13,697 | 9,192 | 14,637 | 6,430
Purchase of investments | 0 | (40) | 15 | 352
Warrants and equity received and classified as Level 3 | 0 | 0 | 0 | 0
Principal payments received on investments | 0 | 493 | 0 | (70)
PIK interest on investments | 0 | 0 | 0 | 0
Proceeds from sale of investments | 0 | (40) | 0 | (40)
Net realized (loss) gain on investments | 0 | 40 | 0 | 40
Unrealized (depreciation) appreciation included in earnings | (7,339) | (462) | (8,294) | (720)
Transfer out of debt investments | 2,093 | 0 | 2,093 | 3,191
Other | 0 | 0 | 0 | 0
Balance | $ 8,451 | $ 9,183 | $ 8,451 | $ 9,183

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