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Note 6 - Fair Value - Reconciliation of Level 3 Assets Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Balance $ 706,858 $ 716,319
Purchase of investments 182,364 218,689
Warrants and equity received and classified as Level 3 2,127 2,852
Principal payments received on investments (146,360) (152,293)
Payment-in-kind interest on investments 3,261 8,433
Proceeds from sale of investments (302) (11,066)
Net realized (loss) gain on investments (34,424) (28,264)
Unrealized appreciation (depreciation) included in earnings (18,986) (44,148)
Transfer out of Level 3 (192) (5,111)
Transfer out of debt and warrant investments 0 0
Other 1,119 1,447
Balance 695,465 706,858
Debt [Member]    
Balance 670,172 686,458
Purchase of investments 178,772 217,285
Warrants and equity received and classified as Level 3 0 0
Principal payments received on investments (146,245) (151,777)
Payment-in-kind interest on investments 3,261 8,433
Proceeds from sale of investments (156) (9,565)
Net realized (loss) gain on investments (34,852) (29,146)
Unrealized appreciation (depreciation) included in earnings 21 (35,564)
Transfer out of Level 3 0 (5,000)
Transfer out of debt and warrant investments (33,313) (12,399)
Other 1,119 1,447
Balance 638,779 670,172
Warrant [Member]    
Balance 22,975 26,145
Purchase of investments 0 0
Warrants and equity received and classified as Level 3 2,127 2,763
Principal payments received on investments 0 0
Payment-in-kind interest on investments 0 0
Proceeds from sale of investments (106) (1,495)
Net realized (loss) gain on investments 388 1,003
Unrealized appreciation (depreciation) included in earnings (5,970) (5,436)
Transfer out of Level 3 (192) 0
Transfer out of debt and warrant investments (2,784) (5)
Other 0 0
Balance 16,438 22,975
Equity Securities [Member]    
Balance 7,281 2,416
Purchase of investments 3,137 1,260
Warrants and equity received and classified as Level 3 0 89
Principal payments received on investments 0 0
Payment-in-kind interest on investments 0 0
Proceeds from sale of investments 0 (6)
Net realized (loss) gain on investments 0 (121)
Unrealized appreciation (depreciation) included in earnings (3,169) (2,496)
Transfer out of Level 3 0 (111)
Transfer out of debt and warrant investments 18,362 6,250
Other 0 0
Balance 25,611 7,281
Other Investments [Member]    
Balance 6,430 1,300
Purchase of investments 455 144
Warrants and equity received and classified as Level 3 0 0
Principal payments received on investments (115) (516)
Payment-in-kind interest on investments 0 0
Proceeds from sale of investments (40) 0
Net realized (loss) gain on investments 40 0
Unrealized appreciation (depreciation) included in earnings (9,868) (652)
Transfer out of Level 3 0 0
Transfer out of debt and warrant investments 17,735 6,154
Other 0 0
Balance $ 14,637 $ 6,430