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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Investments, fair value   $ 697,891     $ 697,891  
Net unrealized appreciation (depreciation) on investments $ (22,156)   $ (24,511)   (54,313) $ (28,471)
Net realized gain (loss) (9,294)   2,464   (9,293) 2,472
Investments, fair value 622,653       622,653  
Interest Income, Operating, Paid in Kind         528 1,737
Investment, Affiliated Issuer, Noncontrolled [Member]            
Investments, fair value 8,307 8,307 12,577 $ 1,132 8,307 1,132
Purchases 0   92   2 107
Reductions 0   (40)   0 (40)
Transfers in/(out) at fair value 0   0   0 0
Discount accretion 0   0   0 0
Net unrealized appreciation (depreciation) on investments (1,600)   3,178   (1,602) 14,611
Net realized gain (loss) 0   40   0 37
Investments, fair value 6,707 8,307 15,847 12,577 6,707 15,847
Interest income 0   0   0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]            
Investments, fair value 0 0 0 0 0 0
Purchases 0   0   0 3
Reductions 0   (40)   0 (40)
Transfers in/(out) at fair value 0   0   0 0
Discount accretion 0   0   0 0
Net unrealized appreciation (depreciation) on investments 0   0   0 0
Net realized gain (loss) 0   40   0 37
Investments, fair value 0 0 0 0 0 0
Interest income 0   0   0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member]            
Investments, fair value 8,307 8,307 12,577 1,132 8,307 1,132
Purchases 0   92   2 104
Reductions 0   0   0 0
Transfers in/(out) at fair value 0   0   0 0
Discount accretion 0   0   0 0
Net unrealized appreciation (depreciation) on investments (1,600)   3,178   (1,602) 14,611
Net realized gain (loss) 0   0   0 0
Investments, fair value 6,707 8,307 15,847 12,577 6,707 15,847
Interest income 0   0   0 0
Investment, Affiliated Issuer, Controlled [Member]            
Investments, fair value 14,869 31,819 13,644 14,223 31,819 14,223
Purchases 1,255   1,500   4,205 2,477
Reductions 0   0   0 (547)
Transfers in/(out) at fair value 0   463   0 463
Discount accretion 0   3   9 7
Net unrealized appreciation (depreciation) on investments (5,669)   (4,402)   (25,786) (5,581)
Net realized gain (loss) 0   0   0 0
Investments, fair value 10,455 14,869 11,386 13,644 10,455 11,386
Interest income 20   188     365
Interest Income, Operating, Paid in Kind 0   178   208 344
Interest Income, Net (41)       (41)  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member]            
Investments, fair value 879 0 7,799 7,993 0 7,993
Purchases 1,107   1,500   2,048 2,250
Reductions 0   0   0 0
Transfers in/(out) at fair value 0   0   0 0
Discount accretion 0   3   0 7
Net unrealized appreciation (depreciation) on investments (1,107)   (3,930)   (1,169) (5,044)
Net realized gain (loss) 0   0   0 0
Investments, fair value 879 879 5,550 7,799 879 5,550
Interest income 0   188     365
Interest Income, Operating, Paid in Kind 0   178   0 344
Interest Income, Net 0       0  
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]            
Investments, fair value 5,290 6,230 5,845 6,230 6,230 6,230
Purchases 0   0   0 227
Reductions 0   0   0 (547)
Transfers in/(out) at fair value 0   463   0 463
Discount accretion 0   0   0 0
Net unrealized appreciation (depreciation) on investments (4,425)   (472)   (5,365) (537)
Net realized gain (loss) 0   0   0 0
Investments, fair value 865 5,290 5,836 $ 5,845 865 5,836
Interest income 0   0     0
Interest Income, Operating, Paid in Kind 0   $ 0   0 $ 0
Interest Income, Net 0       0  
Investment, Affiliated Issuer, Controlled [Member] | Nexii Building Solutions, Inc [Member]            
Investments, fair value 8,700 8,547     8,547  
Purchases 11       11  
Reductions 0       0  
Transfers in/(out) at fair value 0       0  
Discount accretion 0       0  
Net unrealized appreciation (depreciation) on investments 0       153  
Net realized gain (loss) 0       0  
Investments, fair value 8,711 8,700     8,711  
Interest income 20          
Interest Income, Operating, Paid in Kind 0       0  
Interest Income, Net 40       40  
Investment, Affiliated Issuer, Controlled [Member] | Swift Health Systems Inc. [Member]            
Investments, fair value 0 17,042     17,042  
Purchases 137       2,146  
Reductions 0       0  
Transfers in/(out) at fair value 0       0  
Discount accretion 0       9  
Net unrealized appreciation (depreciation) on investments (137)       (19,405)  
Net realized gain (loss) 0       0  
Investments, fair value 0 $ 0     0  
Interest income 0          
Interest Income, Operating, Paid in Kind 0       208  
Interest Income, Net $ (81)       $ (81)