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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Balance | $ 713,244 | $ 577,380 | $ 716,319 | $ 457,557
Purchase of investments | 66,935 | 94,627 | 154,488 | 348,347
Warrants received and classified as Level 3 | 1,294 | 964 | 2,039 | 2,441
Principal payments received on investments | (25,726) | 26,960 | (90,222) | 114,433
Payment-in-kind interest on investments | 3,934 |  | 6,088 |
Proceeds from sale of investments | (2,557) | 6,126 | (11,063) | 49,552
Net realized (loss) gain on investments | (11,552) | (8,195) | (28,198) | (9,094)
Unrealized (depreciation) appreciation included in earnings | (20,722) | 4,227 | (26,384) | 2,720
Transfer out of Level 3 | (5,000) | (1,117) | (5,111) | (1,117)
Transfer out of debt investments | 0 | 0 | 0 | 0
Other | (715) | (541) | 1,179 | (2,610)
Balance | 719,135 | 634,259 | 719,135 | 634,259
Principal payments received on investments | 25,726 | (26,960) | 90,222 | (114,433)
Proceeds from sale of investments | 2,557 | (6,126) | 11,063 | (49,552)
Debt [Member] |  |  |  |
Balance | 683,309 | 551,560 | 686,458 | 437,317
Purchase of investments | 66,185 | 94,627 | 153,728 | 348,097
Warrants received and classified as Level 3 | 0 | 0 | 0 | 0
Principal payments received on investments | (25,726) | 26,929 | (90,222) | 114,120
Payment-in-kind interest on investments | 3,934 |  | 6,088 |
Proceeds from sale of investments | (2,528) | 6,088 | (9,564) | 49,088
Net realized (loss) gain on investments | (11,440) | (8,492) | (29,105) | (8,492)
Unrealized (depreciation) appreciation included in earnings | (18,877) | 8,095 | (21,325) | 1,128
Transfer out of Level 3 | (5,000) | 0 | (5,000) | 0
Transfer out of debt investments | (9,304) | (3,200) | (12,399) | (3,200)
Other | (715) | (541) | 1,179 | (2,610)
Balance | 679,838 | 609,032 | 679,838 | 609,032
Principal payments received on investments | 25,726 | (26,929) | 90,222 | (114,120)
Proceeds from sale of investments | 2,528 | (6,088) | 9,564 | (49,088)
Warrant [Member] |  |  |  |
Balance | 24,376 | 25,167 | 26,145 | 19,837
Purchase of investments | 0 | 0 | 0 | 0
Warrants received and classified as Level 3 | 1,294 | 964 | 1,950 | 2,441
Principal payments received on investments | 0 | 0 | 0 | 0
Payment-in-kind interest on investments | 0 |  | 0 |
Proceeds from sale of investments | (23) | 38 | (1,493) | 464
Net realized (loss) gain on investments | (118) | 266 | 1,028 | 535
Unrealized (depreciation) appreciation included in earnings | (296) | (3,348) | (2,392) | 662
Transfer out of Level 3 | 0 | (1,117) | 0 | (1,117)
Transfer out of debt investments | 0 | 0 | (5) | 0
Other | 0 | 0 | 0 | 0
Balance | 25,233 | 21,894 | 25,233 | 21,894
Principal payments received on investments | (0) | 0 | (0) | 0
Proceeds from sale of investments | 23 | (38) | 1,493 | (464)
Equity Securities [Member] |  |  |  |
Balance | 4,259 | 453 | 2,416 | 203
Purchase of investments | 750 | 0 | 760 | 250
Warrants received and classified as Level 3 | 0 | 0 | 89 | 0
Principal payments received on investments | 0 | 0 | 0 | 0
Payment-in-kind interest on investments | 0 |  | 0 |
Proceeds from sale of investments | (6) | 0 | (6) | 0
Net realized (loss) gain on investments | 6 | 0 | (121) | 0
Unrealized (depreciation) appreciation included in earnings | (1,349) | (420) | (2,467) | (420)
Transfer out of Level 3 | 0 | 0 | (111) | 0
Transfer out of debt investments | 3,150 | 2,000 | 6,250 | 2,000
Other | 0 | 0 | 0 | 0
Balance | 6,810 | 2,033 | 6,810 | 2,033
Principal payments received on investments | (0) | 0 | (0) | 0
Proceeds from sale of investments | 6 | 0 | 6 | 0
Other Investments [Member] |  |  |  |
Balance | 1,300 | 200 | 1,300 | 200
Purchase of investments | 0 | 0 | 0 | 0
Warrants received and classified as Level 3 | 0 | 0 | 0 | 0
Principal payments received on investments | 0 | 31 | 0 | 313
Payment-in-kind interest on investments | 0 |  | 0 |
Proceeds from sale of investments | 0 | 0 | 0 | 0
Net realized (loss) gain on investments | 0 | 31 | 0 | (1,137)
Unrealized (depreciation) appreciation included in earnings | (200) | (100) | (200) | 1,350
Transfer out of Level 3 | 0 | 0 | 0 | 0
Transfer out of debt investments | 6,154 | 1,200 | 6,154 | 1,200
Other | 0 | 0 | 0 | 0
Balance | 7,254 | 1,300 | 7,254 | 1,300
Principal payments received on investments | (0) | (31) | (0) | (313)
Proceeds from sale of investments | $ (0) | $ 0 | $ (0) | $ 0

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