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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, 2023 | Dec. 31, 2022
Balance | $ 716,319 | $ 457,557
Purchase of investments | 218,689 | 421,978
Warrants and equity received and classified as Level 3 | 2,852 | 5,672
Principal payments received on investments | (152,293) | 95,871
Payment-in-kind interest on investments | 8,433 |
Proceeds from sale of investments | (11,066) | 49,835
Net realized (loss) gain on investments | (28,264) | (9,094)
Unrealized (depreciation) appreciation included in earnings | (44,148) | (6,880)
Transfer out of Level 3 | (5,111) | (1,371)
Transfer out of debt and warrant investments | 0 | 0
Other | 1,447 | (5,837)
Balance | 706,858 | 716,319
Principal payments received on investments | 152,293 | (95,871)
Proceeds from sale of investments | 11,066 | (49,835)
Debt [Member] |  |
Balance | 686,458 | 437,317
Purchase of investments | 217,285 | 421,372
Warrants and equity received and classified as Level 3 | 0 | 0
Principal payments received on investments | (151,777) | 95,558
Payment-in-kind interest on investments | 8,433 |
Proceeds from sale of investments | (9,565) | 49,371
Net realized (loss) gain on investments | (29,146) | (8,221)
Unrealized (depreciation) appreciation included in earnings | (35,564) | (10,044)
Transfer out of Level 3 | (5,000) | 0
Transfer out of debt and warrant investments | (12,399) | (3,200)
Other | 1,447 | (5,837)
Balance | 670,172 | 686,458
Principal payments received on investments | 151,777 | (95,558)
Proceeds from sale of investments | 9,565 | (49,371)
Warrant [Member] |  |
Balance | 26,145 | 19,837
Purchase of investments | 0 | 0
Warrants and equity received and classified as Level 3 | 2,763 | 5,664
Principal payments received on investments | 0 | 0
Payment-in-kind interest on investments | 0 |
Proceeds from sale of investments | (1,495) | 464
Net realized (loss) gain on investments | 1,003 | 264
Unrealized (depreciation) appreciation included in earnings | (5,436) | 2,215
Transfer out of Level 3 | 0 | (1,371)
Transfer out of debt and warrant investments | (5) | 0
Other | 0 | 0
Balance | 22,975 | 26,145
Principal payments received on investments | (0) | 0
Proceeds from sale of investments | 1,495 | (464)
Equity Securities [Member] |  |
Balance | 2,416 | 203
Purchase of investments | 1,260 | 606
Warrants and equity received and classified as Level 3 | 89 | 8
Principal payments received on investments | 0 | 0
Payment-in-kind interest on investments | 0 |
Proceeds from sale of investments | (6) | 0
Net realized (loss) gain on investments | (121) | 0
Unrealized (depreciation) appreciation included in earnings | (2,496) | (401)
Transfer out of Level 3 | (111) | 0
Transfer out of debt and warrant investments | 6,250 | 2,000
Other | 0 | 0
Balance | 7,281 | 2,416
Principal payments received on investments | (0) | 0
Proceeds from sale of investments | 6 | 0
Other Investments [Member] |  |
Balance | 1,300 | 200
Purchase of investments | 144 | 0
Warrants and equity received and classified as Level 3 | 0 | 0
Principal payments received on investments | (516) | 313
Payment-in-kind interest on investments | 0 |
Proceeds from sale of investments | 0 | 0
Net realized (loss) gain on investments | 0 | (1,137)
Unrealized (depreciation) appreciation included in earnings | (652) | 1,350
Transfer out of Level 3 | 0 | 0
Transfer out of debt and warrant investments | 6,154 | 1,200
Other | 0 | 0
Balance | 6,430 | 1,300
Principal payments received on investments | 516 | (313)
Proceeds from sale of investments | $ (0) | $ 0

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