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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Balance | $ 646,232 | $ 713,244 | $ 706,858 | $ 716,319
Purchase of investments | 85,827 | 66,935 | 121,211 | 154,488
Warrants and equity received and classified as Level 3 | 411 | 1,294 | 1,628 | 2,039
Principal payments received on investments | (44,392) | (25,726) | (120,448) | (90,222)
Payment-in-kind interest on investments | 377 | 3,934 | 2,114 | 6,088
Proceeds from sale of investments | (69) | (2,557) | (157) | (11,063)
Net realized (loss) gain on investments | (33,894) | (11,552) | (31,213) | (28,198)
Unrealized appreciation (depreciation) included in earnings | 28,974 | (20,722) | 1,906 | (26,384)
Transfer out of warrant investments | 0 | 0 | 0 | 0
Other | (456) | (715) | 1,111 | 1,179
Balance | 683,010 | 719,135 | 683,010 | 719,135
Transfer out of Level 3 | 0 | (5,000) | 0 | (5,111)
Debt [Member] |  |  |  |
Balance | 609,068 | 683,309 | 670,172 | 686,458
Purchase of investments | 85,782 | 66,185 | 119,564 | 153,728
Warrants and equity received and classified as Level 3 | 0 | 0 | 0 | 0
Principal payments received on investments | (44,347) | (25,726) | (120,333) | (90,222)
Payment-in-kind interest on investments | 377 | 3,934 | 2,114 | 6,088
Proceeds from sale of investments | (69) | (2,528) | (113) | (9,564)
Net realized (loss) gain on investments | (33,385) | (11,440) | (33,344) | (29,105)
Unrealized appreciation (depreciation) included in earnings | 37,574 | (18,877) | 18,564 | (21,325)
Transfer out of warrant investments | (21,260) | (9,304) | (24,451) | (12,399)
Other | (456) | (715) | 1,111 | 1,179
Balance | 633,284 | 679,838 | 633,284 | 679,838
Transfer out of Level 3 |  | (5,000) |  | (5,000)
Warrant [Member] |  |  |  |
Balance | 21,131 | 24,376 | 22,975 | 26,145
Purchase of investments | 0 | 0 | 0 | 0
Warrants and equity received and classified as Level 3 | 411 | 1,294 | 1,628 | 1,950
Principal payments received on investments | 0 | 0 | 0 | 0
Payment-in-kind interest on investments | 0 | 0 | 0 | 0
Proceeds from sale of investments | 0 | (23) | (4) | (1,493)
Net realized (loss) gain on investments | (509) | (118) | 2,091 | 1,028
Unrealized appreciation (depreciation) included in earnings | (2,655) | (296) | (5,631) | (2,392)
Transfer out of warrant investments | (73) | 0 | (2,754) | (5)
Other | 0 | 0 | 0 | 0
Balance | 18,305 | 25,233 | 18,305 | 25,233
Transfer out of Level 3 |  | 0 |  | 0
Equity Securities [Member] |  |  |  |
Balance | 6,850 | 4,259 | 7,281 | 2,416
Purchase of investments | 0 | 750 | 1,250 | 760
Warrants and equity received and classified as Level 3 | 0 | 0 | 0 | 89
Principal payments received on investments | 0 | 0 | 0 | 0
Payment-in-kind interest on investments | 0 | 0 | 0 | 0
Proceeds from sale of investments | 0 | (6) | 0 | (6)
Net realized (loss) gain on investments | 0 | 6 | 0 | (121)
Unrealized appreciation (depreciation) included in earnings | (162) | (1,349) | (4,524) | (2,467)
Transfer out of warrant investments | 6,789 | 3,150 | 9,470 | 6,250
Other | 0 | 0 | 0 | 0
Balance | 13,477 | 6,810 | 13,477 | 6,810
Transfer out of Level 3 |  | 0 |  | (111)
Other Investments [Member] |  |  |  |
Balance | 9,183 | 1,300 | 6,430 | 1,300
Purchase of investments | 45 | 0 | 397 | 0
Warrants and equity received and classified as Level 3 | 0 | 0 | 0 | 0
Principal payments received on investments | (45) | 0 | (115) | 0
Payment-in-kind interest on investments | 0 | 0 | 0 | 0
Proceeds from sale of investments | 0 | 0 | (40) | 0
Net realized (loss) gain on investments | 0 | 0 | 40 | 0
Unrealized appreciation (depreciation) included in earnings | (5,783) | (200) | (6,503) | (200)
Transfer out of warrant investments | 14,544 | 6,154 | 17,735 | 6,154
Other | 0 | 0 | 0 | 0
Balance | $ 17,944 | 7,254 | $ 17,944 | 7,254
Transfer out of Level 3 |  | $ 0 |  | $ 0

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