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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Balance $ 646,232 $ 713,244 $ 706,858 $ 716,319
Purchase of investments 85,827 66,935 121,211 154,488
Warrants and equity received and classified as Level 3 411 1,294 1,628 2,039
Principal payments received on investments (44,392) (25,726) (120,448) (90,222)
Payment-in-kind interest on investments 377 3,934 2,114 6,088
Proceeds from sale of investments (69) (2,557) (157) (11,063)
Net realized (loss) gain on investments (33,894) (11,552) (31,213) (28,198)
Unrealized appreciation (depreciation) included in earnings 28,974 (20,722) 1,906 (26,384)
Transfer out of warrant investments 0 0 0 0
Other (456) (715) 1,111 1,179
Balance 683,010 719,135 683,010 719,135
Transfer out of Level 3 0 (5,000) 0 (5,111)
Debt [Member]        
Balance 609,068 683,309 670,172 686,458
Purchase of investments 85,782 66,185 119,564 153,728
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments (44,347) (25,726) (120,333) (90,222)
Payment-in-kind interest on investments 377 3,934 2,114 6,088
Proceeds from sale of investments (69) (2,528) (113) (9,564)
Net realized (loss) gain on investments (33,385) (11,440) (33,344) (29,105)
Unrealized appreciation (depreciation) included in earnings 37,574 (18,877) 18,564 (21,325)
Transfer out of warrant investments (21,260) (9,304) (24,451) (12,399)
Other (456) (715) 1,111 1,179
Balance 633,284 679,838 633,284 679,838
Transfer out of Level 3   (5,000)   (5,000)
Warrant [Member]        
Balance 21,131 24,376 22,975 26,145
Purchase of investments 0 0 0 0
Warrants and equity received and classified as Level 3 411 1,294 1,628 1,950
Principal payments received on investments 0 0 0 0
Payment-in-kind interest on investments 0 0 0 0
Proceeds from sale of investments 0 (23) (4) (1,493)
Net realized (loss) gain on investments (509) (118) 2,091 1,028
Unrealized appreciation (depreciation) included in earnings (2,655) (296) (5,631) (2,392)
Transfer out of warrant investments (73) 0 (2,754) (5)
Other 0 0 0 0
Balance 18,305 25,233 18,305 25,233
Transfer out of Level 3   0   0
Equity Securities [Member]        
Balance 6,850 4,259 7,281 2,416
Purchase of investments 0 750 1,250 760
Warrants and equity received and classified as Level 3 0 0 0 89
Principal payments received on investments 0 0 0 0
Payment-in-kind interest on investments 0 0 0 0
Proceeds from sale of investments 0 (6) 0 (6)
Net realized (loss) gain on investments 0 6 0 (121)
Unrealized appreciation (depreciation) included in earnings (162) (1,349) (4,524) (2,467)
Transfer out of warrant investments 6,789 3,150 9,470 6,250
Other 0 0 0 0
Balance 13,477 6,810 13,477 6,810
Transfer out of Level 3   0   (111)
Other Investments [Member]        
Balance 9,183 1,300 6,430 1,300
Purchase of investments 45 0 397 0
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments (45) 0 (115) 0
Payment-in-kind interest on investments 0 0 0 0
Proceeds from sale of investments 0 0 (40) 0
Net realized (loss) gain on investments 0 0 40 0
Unrealized appreciation (depreciation) included in earnings (5,783) (200) (6,503) (200)
Transfer out of warrant investments 14,544 6,154 17,735 6,154
Other 0 0 0 0
Balance $ 17,944 7,254 $ 17,944 7,254
Transfer out of Level 3   $ 0   $ 0