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Note 6 - Fair Value - Reconciliation of Level 3 Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Balance | $ 706,858 | $ 716,319
Purchase of investments | 182,364 | 218,689
Warrants and equity received and classified as Level 3 | 2,127 | 2,852
Principal payments received on investments | (146,360) | (152,293)
Payment-in-kind interest on investments | 3,261 | 8,433
Proceeds from sale of investments | (302) | (11,066)
Net realized (loss) gain on investments | (34,424) | (28,264)
Unrealized appreciation (depreciation) included in earnings | (18,986) | (44,148)
Transfer out of Level 3 | (192) | (5,111)
Transfer out of debt and warrant investments | 0 | 0
Other | 1,119 | 1,447
Balance | 695,465 | 706,858
Debt [Member] |  |
Balance | 670,172 | 686,458
Purchase of investments | 178,772 | 217,285
Warrants and equity received and classified as Level 3 | 0 | 0
Principal payments received on investments | (146,245) | (151,777)
Payment-in-kind interest on investments | 3,261 | 8,433
Proceeds from sale of investments | (156) | (9,565)
Net realized (loss) gain on investments | (34,852) | (29,146)
Unrealized appreciation (depreciation) included in earnings | 21 | (35,564)
Transfer out of Level 3 | 0 | (5,000)
Transfer out of debt and warrant investments | (33,313) | (12,399)
Other | 1,119 | 1,447
Balance | 638,779 | 670,172
Warrant [Member] |  |
Balance | 22,975 | 26,145
Purchase of investments | 0 | 0
Warrants and equity received and classified as Level 3 | 2,127 | 2,763
Principal payments received on investments | 0 | 0
Payment-in-kind interest on investments | 0 | 0
Proceeds from sale of investments | (106) | (1,495)
Net realized (loss) gain on investments | 388 | 1,003
Unrealized appreciation (depreciation) included in earnings | (5,970) | (5,436)
Transfer out of Level 3 | (192) | 0
Transfer out of debt and warrant investments | (2,784) | (5)
Other | 0 | 0
Balance | 16,438 | 22,975
Equity Securities [Member] |  |
Balance | 7,281 | 2,416
Purchase of investments | 3,137 | 1,260
Warrants and equity received and classified as Level 3 | 0 | 89
Principal payments received on investments | 0 | 0
Payment-in-kind interest on investments | 0 | 0
Proceeds from sale of investments | 0 | (6)
Net realized (loss) gain on investments | 0 | (121)
Unrealized appreciation (depreciation) included in earnings | (3,169) | (2,496)
Transfer out of Level 3 | 0 | (111)
Transfer out of debt and warrant investments | 18,362 | 6,250
Other | 0 | 0
Balance | 25,611 | 7,281
Other Investments [Member] |  |
Balance | 6,430 | 1,300
Purchase of investments | 455 | 144
Warrants and equity received and classified as Level 3 | 0 | 0
Principal payments received on investments | (115) | (516)
Payment-in-kind interest on investments | 0 | 0
Proceeds from sale of investments | (40) | 0
Net realized (loss) gain on investments | 40 | 0
Unrealized appreciation (depreciation) included in earnings | (9,868) | (652)
Transfer out of Level 3 | 0 | 0
Transfer out of debt and warrant investments | 17,735 | 6,154
Other | 0 | 0
Balance | $ 14,637 | $ 6,430

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