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Note 6 - Fair Value - Reconciliation of Level 3 Assets Measured on a Recurring Basis (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Balance $ 713,407,000 $ 514,242,000 $ 716,319,000 $ 457,557,000
Purchase of investments 40,545,000 159,235,000 87,553,000 253,720,000
Warrants and equity received and classified as Level 3 604,000 669,000 745,000 1,477,000
Principal payments received on investments (24,740,000) 73,328,000 (64,496,000) 87,473,000
Payment-in-kind interest on investments 950,000   2,154,000  
Proceeds from sale of investments (1,986,000) 22,146,000 (8,506,000) 43,426,000
Net realized (loss) gain on investments (16,512,000) (929,000) (16,646,000) (899,000)
Unrealized appreciation (depreciation) included in earnings 205,000 613,000 (5,662) (1,507,000)
Transfer out of Level 3 (111,000) 0 (111,000) 0
Transfer out of debt investments 0   0  
Other 882,000 (976,000) 1,894,000 (2,069,000)
Balance 713,244,000 577,380,000 713,244,000 577,380,000
Principal payments received on investments 24,740,000 (73,328,000) 64,496,000 (87,473,000)
Proceeds from sale of investments 1,986,000 (22,146,000) 8,506,000 (43,426,000)
Debt [Member]        
Balance 684,554,000 492,194,000 686,458,000 437,317,000
Purchase of investments 40,545,000 158,985,000 87,543,000 253,470,000
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments (24,740,000) 73,096,000 (64,496,000) 87,191,000
Payment-in-kind interest on investments 950,000   2,154,000  
Proceeds from sale of investments (528,000) 21,750,000 (7,036,000) 43,000,000
Net realized (loss) gain on investments (17,672,000) 0 (17,665,000) 0
Unrealized appreciation (depreciation) included in earnings 2,118,000 (3,797,000) (2,448) (6,967,000)
Transfer out of Level 3 0   0  
Transfer out of debt investments (2,800,000)   (3,095,000)  
Other 882,000 (976,000) 1,894,000 (2,069,000)
Balance 683,309,000 551,560,000 683,309,000 551,560,000
Principal payments received on investments 24,740,000 (73,096,000) 64,496,000 (87,191,000)
Proceeds from sale of investments 528,000 (21,750,000) 7,036,000 (43,000,000)
Warrant [Member]        
Balance 24,638,000 21,645,000 26,145,000 19,837,000
Purchase of investments 0 0 0 0
Warrants and equity received and classified as Level 3 515,000 669,000 656,000 1,477,000
Principal payments received on investments 0 0 0 0
Payment-in-kind interest on investments 0   0  
Proceeds from sale of investments (1,458,000) 396,000 (1,470,000) 426,000
Net realized (loss) gain on investments 1,287,000 239,000 1,146,000 269,000
Unrealized appreciation (depreciation) included in earnings (606,000) 3,010,000 (2,096) 4,010,000
Transfer out of Level 3 0   0  
Transfer out of debt investments 0   (5,000)  
Other 0 0 0 0
Balance 24,376,000 25,167,000 24,376,000 25,167,000
Principal payments received on investments (0) 0 (0) 0
Proceeds from sale of investments 1,458,000 (396,000) 1,470,000 (426,000)
Equity Securities [Member]        
Balance 2,915,000 203,000 2,416,000 203,000
Purchase of investments 0 250,000 10,000 250,000
Warrants and equity received and classified as Level 3 89,000 0 89,000 0
Principal payments received on investments 0 0 0 0
Payment-in-kind interest on investments 0   0  
Proceeds from sale of investments 0 0 0 0
Net realized (loss) gain on investments (127,000) 0 (127,000) 0
Unrealized appreciation (depreciation) included in earnings (1,307,000) 0 (1,118) 0
Transfer out of Level 3 (111,000)   (111,000)  
Transfer out of debt investments 2,800,000   3,100,000  
Other 0 0 0 0
Balance 4,259,000 453,000 4,259,000 453,000
Principal payments received on investments (0) 0 (0) 0
Proceeds from sale of investments (0) 0 (0) 0
Other Investments [Member]        
Balance 1,300,000 200,000 1,300,000 200,000
Purchase of investments 0 0 0 0
Warrants and equity received and classified as Level 3 0 0 0 0
Principal payments received on investments 0 232,000 0 282,000
Payment-in-kind interest on investments 0   0  
Proceeds from sale of investments 0 0 0 0
Net realized (loss) gain on investments 0 (1,168,000) 0 (1,168,000)
Unrealized appreciation (depreciation) included in earnings 0 1,400,000 0 1,450,000
Transfer out of Level 3 0   0  
Transfer out of debt investments 0   0  
Other 0 0 0 0
Balance 1,300,000 200,000 1,300,000 200,000
Principal payments received on investments (0) (232,000) (0) (282,000)
Proceeds from sale of investments $ (0) $ 0 $ (0) $ 0