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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Balance $ 620,990 $ 646,232 $ 695,465 $ 706,858
Purchase of investments 37,747 85,827 153,805 121,211
Warrants and equity received and classified as Level 3 3,270 411 3,552 1,628
Principal payments received on investments (75,366) (44,392) (204,604) (120,448)
PIK interest on investments 664 377 1,192 2,114
Proceeds from sale of investments (4,533) (69) (5,317) (157)
Net realized (loss) gain on investments (22,527) (33,894) (31,820) (31,213)
Unrealized appreciation (depreciation) included in earnings 41,111 28,974 (12,434) 1,906
Transfer out of Level 3 (2,617) 0 (2,617)  
Transfer out of debt investments 0 0 0 0
Other 1,089 (456) 2,606 1,111
Balance 599,828 683,010 599,828 683,010
Debt [Member]        
Balance 579,171 609,068 638,779 670,172
Purchase of investments 32,441 85,782 146,295 119,564
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments (73,342) (44,347) (202,580) (120,333)
PIK interest on investments 664 377 1,192 2,114
Proceeds from sale of investments (2) (69) (4) (113)
Net realized (loss) gain on investments (371) (33,385) (9,734) (33,344)
Unrealized appreciation (depreciation) included in earnings 31,988 37,574 (2,823) 18,564
Transfer out of Level 3 0   0  
Transfer out of debt investments (11,448) (21,260) (13,541) (24,451)
Other 1,089 (456) 2,606 1,111
Balance 560,190 633,284 560,190 633,284
Warrant [Member]        
Balance 20,456 21,131 16,438 22,975
Purchase of investments 750 0 750 0
Warrants and equity received and classified as Level 3 61 411 343 1,628
Principal payments received on investments 0 0 0 0
PIK interest on investments 0 0 0 0
Proceeds from sale of investments (2,724) 0 (3,303) (4)
Net realized (loss) gain on investments 4,319 (509) 4,220 2,091
Unrealized appreciation (depreciation) included in earnings (4,919) (2,655) (505) (5,631)
Transfer out of Level 3 (2,601)   (2,601)  
Transfer out of debt investments 0 (73) 0 (2,754)
Other 0 0 0
Balance 15,342 18,305 15,342 18,305
Equity Securities [Member]        
Balance 12,912 6,850 25,611 7,281
Purchase of investments 3,772 0 5,961 1,250
Warrants and equity received and classified as Level 3 3,209 0 3,209 0
Principal payments received on investments 0 0 0 0
PIK interest on investments 0 0 0 0
Proceeds from sale of investments (643) 0 (846) 0
Net realized (loss) gain on investments (17,931) 0 (17,762) 0
Unrealized appreciation (depreciation) included in earnings 9,796 (162) (5,058) (4,524)
Transfer out of Level 3 0   0  
Transfer out of debt investments 10,000 6,789 10,000 9,470
Other 0 0 0 0
Balance 21,115 13,477 21,115 13,477
Other Investments [Member]        
Balance 8,451 9,183 14,637 6,430
Purchase of investments 784 45 799 397
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments (2,024) (45) (2,024) (115)
PIK interest on investments 0 0 0 0
Proceeds from sale of investments (1,164) 0 (1,164) (40)
Net realized (loss) gain on investments (8,544) 0 (8,544) 40
Unrealized appreciation (depreciation) included in earnings 4,246 (5,783) (4,048) (6,503)
Transfer out of Level 3 (16)   (16)  
Transfer out of debt investments 1,448 14,544 3,541 17,735
Other 0 0 0 0
Balance $ 3,181 $ 17,944 $ 3,181 $ 17,944