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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Balance $ 687,397 $ 709,946 $ 695,465 $ 706,858
Purchase of investments 42,369 12,065 116,058 35,384
Warrants and equity received and classified as Level 3 117 1,089 282 1,217
Principal payments received on investments (78,493) (56,413) (129,238) (76,056)
PIK interest on investments 243 355 528 1,737
Proceeds from sale of investments (783) (47) (784) (88)
Net realized (loss) gain on investments (9,294) 2,660 (9,293) 2,681
Unrealized (depreciation) appreciation included in earnings (21,658) (24,165) (53,545) (27,068)
Transfer out of debt investments 0 0 0 0
Other 1,092 742 1,517 1,567
Balance 620,990 646,232 620,990 646,232
Debt [Member]        
Balance 643,567 670,773 638,779 670,172
Purchase of investments 42,225 11,605 113,854 33,782
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments (78,493) (56,906) (129,238) (75,986)
PIK interest on investments 243 355 528 1,737
Proceeds from sale of investments (1) (3) (2) (44)
Net realized (loss) gain on investments (9,364) 3 (9,363) 41
Unrealized (depreciation) appreciation included in earnings (18,005) (17,501) (34,811) (19,010)
Transfer out of debt investments (2,093) 0 (2,093) (3,191)
Other 1,092 742 1,517 1,567
Balance 579,171 609,068 579,171 609,068
Warrant [Member]        
Balance 17,159 23,156 16,438 22,975
Purchase of investments 0 0 0 0
Warrants and equity received and classified as Level 3 117 1,089 282 1,217
Principal payments received on investments 0 0 0 0
PIK interest on investments 0 0 0 0
Proceeds from sale of investments (579) (4) (579) (4)
Net realized (loss) gain on investments (99) 2,617 (99) 2,600
Unrealized (depreciation) appreciation included in earnings 3,858 (3,046) 4,414 (2,976)
Transfer out of debt investments 0 (2,681) 0 (2,681)
Other 0 0 0
Balance 20,456 21,131 20,456 21,131
Equity Securities [Member]        
Balance 12,974 6,825 25,611 7,281
Purchase of investments 144 500 2,189 1,250
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments 0 0 0 0
PIK interest on investments 0 0 0 0
Proceeds from sale of investments (203) 0 (203) 0
Net realized (loss) gain on investments 169 0 169 0
Unrealized (depreciation) appreciation included in earnings (172) (3,156) (14,854) (4,362)
Transfer out of debt investments 0 2,681 0 2,681
Other 0 0 0 0
Balance 12,912 6,850 12,912 6,850
Other Investments [Member]        
Balance 13,697 9,192 14,637 6,430
Purchase of investments 0 (40) 15 352
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments 0 493 0 (70)
PIK interest on investments 0 0 0 0
Proceeds from sale of investments 0 (40) 0 (40)
Net realized (loss) gain on investments 0 40 0 40
Unrealized (depreciation) appreciation included in earnings (7,339) (462) (8,294) (720)
Transfer out of debt investments 2,093 0 2,093 3,191
Other 0 0 0 0
Balance $ 8,451 $ 9,183 $ 8,451 $ 9,183