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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments, fair value     $ 697,891  
Net unrealized appreciation (depreciation) on investments $ 40,517 $ 29,335 (13,796) $ 864
Net realized gain (loss) (22,527) (33,894) (31,820) (31,422)
Investments, fair value 603,514   603,514  
Interest Income, Operating, Paid in Kind     1,192 2,114
Investment, Affiliated Issuer, Noncontrolled [Member]        
Investments, fair value 6,707 15,847 8,307 1,132
Purchases 5,367 127 5,369 234
Reductions (2,023) (1,430) (2,023) (1,470)
Transfers in/(out) at fair value 32,941 0 32,941 0
Discount accretion 12 0 12 0
Net unrealized appreciation (depreciation) on investments 1,812 (6,237) 210 8,374
Net realized gain (loss) 0 0 0 37
Investments, fair value 44,816 8,307 44,816 8,307
Interest income 462 0 462 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]        
Investments, fair value 0 0 0 0
Purchases 0 0 0 3
Reductions 0 0 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 0 0 37
Investments, fair value 0 0 0 0
Interest income 0 0 0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member]        
Investments, fair value 6,707 15,847 8,307 1,132
Purchases 0 127 2 231
Reductions (2,023) (1,430) (2,023) (1,430)
Transfers in/(out) at fair value 0 0 0 0
Discount accretion 0 0 0 0
Net unrealized appreciation (depreciation) on investments (3,334) (6,237) (4,936) 8,374
Net realized gain (loss) 0 0 0 0
Investments, fair value 1,350 8,307 1,350 8,307
Interest income 0 0 0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Shengrow Inc. [Member]        
Investments, fair value 0   0  
Purchases 5,367   5,367  
Reductions 0   0  
Transfers in/(out) at fair value 32,941   32,941  
Discount accretion 12   12  
Net unrealized appreciation (depreciation) on investments 5,146   5,146  
Net realized gain (loss) 0   0  
Investments, fair value 43,466   43,466  
Interest income 462   462  
Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value 10,455 11,386 31,819 14,223
Purchases 3,910 1,290 8,115 3,767
Reductions 0 (45) 0 (592)
Transfers in/(out) at fair value (1,178) 6,716 (1,178) 7,179
Discount accretion 0 3 9 10
Net unrealized appreciation (depreciation) on investments 13,046 165 (12,740) (5,416)
Net realized gain (loss) (25,117) 0 (25,117) 0
Investments, fair value 1,116 19,731 1,116 19,731
Interest income 25 241   606
Interest Income, Operating, Paid in Kind 0 216 208 560
Interest Income, Net (16)   (16)  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member]        
Investments, fair value 879 5,550 0 7,993
Purchases 306 500 2,354 2,750
Reductions 0 0 0 0
Transfers in/(out) at fair value 0 0 0 0
Discount accretion 0 3 0 10
Net unrealized appreciation (depreciation) on investments 3,376 (5) 2,207 (5,049)
Net realized gain (loss) (4,561) 0 (4,561) 0
Investments, fair value 0 6,264 0 6,264
Interest income 0 226   591
Interest Income, Operating, Paid in Kind 0 216 0 560
Interest Income, Net 0   0  
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]        
Investments, fair value 865 5,836 6,230 6,230
Purchases 370 0 370 227
Reductions 0 (45) 0 (592)
Transfers in/(out) at fair value (1,178) 0 (1,178) 463
Discount accretion 0 0 0 0
Net unrealized appreciation (depreciation) on investments (57) 499 (5,422) (38)
Net realized gain (loss) 0 0 0 0
Investments, fair value 0 6,290 0 6,290
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 8,711 0 8,547 0
Purchases 3,218 790 3,229 790
Reductions 0 0 0 0
Transfers in/(out) at fair value 0 6,716 0 6,716
Discount accretion 0 0 0 0
Net unrealized appreciation (depreciation) on investments (10,813) (329) (10,660) (329)
Net realized gain (loss) 0 0 0 0
Investments, fair value 1,116 7,177 1,116 7,177
Interest income 25 15   15
Interest Income, Operating, Paid in Kind 0 $ 0 0 $ 0
Interest Income, Net 65   65  
Investment, Affiliated Issuer, Controlled [Member] | Swift Health Systems Inc. [Member]        
Investments, fair value 0   17,042  
Purchases 16   2,162  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   9  
Net unrealized appreciation (depreciation) on investments 20,540   1,135  
Net realized gain (loss) (20,556)   (20,556)  
Investments, fair value 0   0  
Interest income 0      
Interest Income, Operating, Paid in Kind 0   208  
Interest Income, Net $ (81)   $ (81)