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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Balance $ 709,946 $ 713,407 $ 706,858 $ 716,319
Purchase of investments 12,065 40,545 35,384 87,553
Warrants received and classified as Level 3 1,089 604 1,217 745
Principal payments received on investments (56,413) (24,740) (76,056) (64,496)
Payment-in-kind interest on investments 355 950 1,737 2,154
Proceeds from sale of investments (47) (1,986) (88) (8,506)
Net realized gain on investments 2,660 (16,512) 2,681 (16,646)
Unrealized depreciation included in earnings (24,165) 205 (27,068) (5,662)
Transfer out of warrant investments 0 0 0 0
Other 742 882 1,567 1,894
Balance 646,232 713,244 646,232 713,244
Transfer out of Level 3 0 (111) 0 (111)
Debt [Member]        
Balance 670,773 684,554 670,172 686,458
Purchase of investments 11,605 40,545 33,782 87,543
Warrants received and classified as Level 3 0 0 0 0
Principal payments received on investments (56,906) (24,740) (75,986) (64,496)
Payment-in-kind interest on investments 355 950 1,737 2,154
Proceeds from sale of investments (3) (528) (44) (7,036)
Net realized gain on investments 3 (17,672) 41 (17,665)
Unrealized depreciation included in earnings (17,501) 2,118 (19,010) (2,448)
Transfer out of warrant investments 0 (2,800) (3,191) (3,095)
Other 742 882 1,567 1,894
Balance 609,068 683,309 609,068 683,309
Transfer out of Level 3   0   0
Warrant [Member]        
Balance 23,156 24,638 22,975 26,145
Purchase of investments 0 0 0 0
Warrants received and classified as Level 3 1,089 515 1,217 656
Principal payments received on investments 0 0 0 0
Payment-in-kind interest on investments 0 0 0 0
Proceeds from sale of investments (4) (1,458) (4) (1,470)
Net realized gain on investments 2,617 1,287 2,600 1,146
Unrealized depreciation included in earnings (3,046) (606) (2,976) (2,096)
Transfer out of warrant investments (2,681) 0 (2,681) (5)
Other 0 0 0 0
Balance 21,131 24,376 21,131 24,376
Transfer out of Level 3   0   0
Equity Securities [Member]        
Balance 6,825 2,915 7,281 2,416
Purchase of investments 500 0 1,250 10
Warrants received and classified as Level 3 0 89 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 0 0 0
Net realized gain on investments 0 (127) 0 (127)
Unrealized depreciation included in earnings (3,156) (1,307) (4,362) (1,118)
Transfer out of warrant investments 2,681 2,800 2,681 3,100
Other 0 0 0 0
Balance 6,850 4,259 6,850 4,259
Transfer out of Level 3   (111)   (111)
Other Investments [Member]        
Balance 9,192 1,300 6,430 1,300
Purchase of investments (40) 0 352 0
Warrants received and classified as Level 3 0 0 0 0
Principal payments received on investments 493 0 (70) 0
Payment-in-kind interest on investments 0 0 0 0
Proceeds from sale of investments (40) 0 (40) 0
Net realized gain on investments 40 0 40 0
Unrealized depreciation included in earnings (462) 0 (720) 0
Transfer out of warrant investments 0 0 3,191 0
Other 0 0 0 0
Balance $ 9,183 1,300 $ 9,183 1,300
Transfer out of Level 3   $ 0   $ 0