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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
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Balance | $ 706,858 | $ 716,319
Purchase of investments | 23,319 | 47,008
Warrants received and classified as Level 3 | 128 | 141
Principal payments received on investments | (19,643) | (39,756)
Payment-in-kind interest on investments | 1,382 | 1,204
Proceeds from sale of investments | (41) | (6,520)
Net realized gain (loss) on investments | 21 | (134)
Unrealized (depreciation) appreciation included in earnings | (2,903) | (5,867)
Transfer out of debt investments | 0 | 0
Other | 825 | 1,012
Balance | 709,946 | 713,407
Debt [Member] |  |
Balance | 670,172 | 686,458
Purchase of investments | 22,177 | 46,998
Warrants received and classified as Level 3 | 0 | 0
Principal payments received on investments | (19,080) | (39,756)
Payment-in-kind interest on investments | 1,382 | 1,204
Proceeds from sale of investments | (41) | (6,508)
Net realized gain (loss) on investments | 38 | 7
Unrealized (depreciation) appreciation included in earnings | (1,509) | (4,566)
Transfer out of debt investments | (3,191) | (295)
Other | 825 | 1,012
Balance | 670,773 | 684,554
Warrant [Member] |  |
Balance | 22,975 | 26,145
Purchase of investments | 0 | 0
Warrants received and classified as Level 3 | 128 | 141
Principal payments received on investments | 0 | 0
Payment-in-kind interest on investments | 0 | 0
Proceeds from sale of investments | 0 | (12)
Net realized gain (loss) on investments | (17) | (141)
Unrealized (depreciation) appreciation included in earnings | 70 | (1,490)
Transfer out of debt investments | 0 | (5)
Other | 0 | 0
Balance | 23,156 | 24,638
Equity Securities [Member] |  |
Balance | 7,281 | 2,416
Purchase of investments | 750 | 10
Warrants received and classified as Level 3 | 0 | 0
Principal payments received on investments | 0 | 0
Payment-in-kind interest on investments | 0 | 0
Proceeds from sale of investments | 0 | 0
Net realized gain (loss) on investments | 0 | 0
Unrealized (depreciation) appreciation included in earnings | (1,206) | 189
Transfer out of debt investments | 0 | 300
Other | 0 | 0
Balance | 6,825 | 2,915
Other Investments [Member] |  |
Balance | 6,430 | 1,300
Purchase of investments | 392 | 0
Warrants received and classified as Level 3 | 0 | 0
Principal payments received on investments | (563) | 0
Payment-in-kind interest on investments | 0 | 0
Proceeds from sale of investments | 0 | 0
Net realized gain (loss) on investments | 0 | 0
Unrealized (depreciation) appreciation included in earnings | (258) | 0
Transfer out of debt investments | 3,191 | 0
Other | 0 | 0
Balance | $ 9,192 | $ 1,300

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