v3.25.4
Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Investments, fair value $ 697,891    
Interest Income, Operating, Paid in Kind 2,349 $ 3,261 $ 8,433
Net unrealized appreciation (depreciation) on investments 10,859 (18,785) (48,780)
Investments, fair value 647,244 697,891  
Net realized gain (loss) on investments (55,114) (34,631) (29,702)
Net realized gain (loss) (55,114) (34,631) (29,702)
Investment, Affiliated Issuer, Noncontrolled [Member]      
Investments, fair value 8,307 1,132  
Purchases 10,016 247  
Reductions (5,976) (1,470)  
Interest Income, Operating, Paid in Kind 1,189 0 0
Transfers in/(out) at fair value 51,374 0  
Discount accretion 138 0  
Net unrealized appreciation (depreciation) on investments (1,904) 8,361 (26,513)
Investments, fair value 63,144 8,307 1,132
Interest Income, Net 1,711    
Net realized gain (loss) on investments 0 37 0
Interest income 522 0 1,245
Net realized gain (loss) 0 37 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]      
Investments, fair value 0 0  
Purchases 0 3  
Reductions 0 (40)  
Interest Income, Operating, Paid in Kind 0 0  
Transfers in/(out) at fair value 0 0  
Discount accretion 0 0  
Net unrealized appreciation (depreciation) on investments 0 0  
Investments, fair value 0 0 0
Interest Income, Net 0    
Interest income   0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member]      
Investments, fair value 8,307 1,132  
Purchases 2 244  
Reductions (2,275) (1,430)  
Interest Income, Operating, Paid in Kind 0 0  
Transfers in/(out) at fair value 0 0  
Discount accretion 0 0  
Net unrealized appreciation (depreciation) on investments (4,548) 8,361  
Investments, fair value 1,486 8,307 1,132
Interest Income, Net 0    
Net realized gain (loss) on investments 0 0  
Interest income   0  
Net realized gain (loss) 0 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Hound Labs II, LLC [Member]      
Investments, fair value 0    
Purchases 0    
Reductions 0    
Interest Income, Operating, Paid in Kind 204    
Transfers in/(out) at fair value 11,350    
Discount accretion 0    
Net unrealized appreciation (depreciation) on investments (185)    
Investments, fair value 11,369 0  
Interest Income, Net 204    
Net realized gain (loss) on investments 0    
Net realized gain (loss) 0    
Investment, Affiliated Issuer, Noncontrolled [Member] | Nexii Building Solutions, Inc [Member]      
Investments, fair value 0    
Purchases 14    
Reductions 0    
Interest Income, Operating, Paid in Kind 0    
Transfers in/(out) at fair value 1,116    
Discount accretion 0    
Net unrealized appreciation (depreciation) on investments (1,130)    
Investments, fair value 0 0  
Interest Income, Net 28    
Net realized gain (loss) on investments 0    
Net realized gain (loss) 0    
Investment, Affiliated Issuer, Noncontrolled [Member] | NextCar Holding Company, Inc [Member]      
Investments, fair value 0    
Purchases 0    
Reductions (3,701)    
Interest Income, Operating, Paid in Kind 0    
Transfers in/(out) at fair value 5,967    
Discount accretion 0    
Net unrealized appreciation (depreciation) on investments (1,187)    
Investments, fair value 1,079 0  
Interest Income, Net 46    
Net realized gain (loss) on investments 0    
Net realized gain (loss) 0    
Investment, Affiliated Issuer, Noncontrolled [Member] | Shengrow Inc. [Member]      
Investments, fair value 0    
Purchases 10,000    
Reductions 0    
Interest Income, Operating, Paid in Kind 985    
Transfers in/(out) at fair value 32,941    
Discount accretion 138    
Net unrealized appreciation (depreciation) on investments 5,146    
Investments, fair value 49,210 0  
Interest Income, Net 1,433    
Net realized gain (loss) on investments 0    
Net realized gain (loss) 0    
Investment, Affiliated Issuer, Controlled [Member]      
Investments, fair value 31,819 14,223  
Purchases 8,115 6,654  
Reductions 0 (592)  
Interest Income, Operating, Paid in Kind 208 1,631 320
Transfers in/(out) at fair value (2,294) 22,641  
Discount accretion 9 16  
Net unrealized appreciation (depreciation) on investments (12,740) (12,754) 2,222
Investments, fair value 0 31,819 14,223
Interest Income, Net (16) 1,749  
Net realized gain (loss) on investments (25,117) 0 0
Net realized gain (loss) (25,117) 0 0
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member]      
Investments, fair value 0 7,993  
Purchases 2,354 3,750  
Reductions 0  
Interest Income, Operating, Paid in Kind 0 805  
Transfers in/(out) at fair value 0 0  
Discount accretion 0 14  
Net unrealized appreciation (depreciation) on investments 2,207 (12,562)  
Investments, fair value 0 0 7,993
Interest Income, Net 0 846  
Net realized gain (loss) on investments (4,561) 0  
Net realized gain (loss) (4,561) 0  
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]      
Investments, fair value 6,230 6,230  
Purchases 370 227  
Reductions 0 (592)  
Interest Income, Operating, Paid in Kind 0 0  
Transfers in/(out) at fair value (1,178) 463  
Discount accretion 0 0  
Net unrealized appreciation (depreciation) on investments (5,422) (98)  
Investments, fair value 0 6,230 6,230
Interest Income, Net 0 0  
Net realized gain (loss) on investments 0 0  
Net realized gain (loss) 0 0  
Investment, Affiliated Issuer, Controlled [Member] | Nexii Building Solutions, Inc [Member]      
Investments, fair value 8,547 0  
Purchases 3,229 790  
Reductions 0 0  
Interest Income, Operating, Paid in Kind 0 0  
Transfers in/(out) at fair value (1,116) 6,716  
Discount accretion 0 0  
Net unrealized appreciation (depreciation) on investments (10,660) 1,041  
Investments, fair value 0 8,547 0
Interest Income, Net 65 35  
Net realized gain (loss) on investments 0 0  
Net realized gain (loss) 0 0  
Investment, Affiliated Issuer, Controlled [Member] | Swift Health Systems Inc. [Member]      
Investments, fair value 17,042 0  
Purchases 2,162 1,887  
Reductions 0 0  
Interest Income, Operating, Paid in Kind 208 826  
Transfers in/(out) at fair value 0 15,462  
Discount accretion 9 2  
Net unrealized appreciation (depreciation) on investments 1,135 (1,135)  
Investments, fair value 0 17,042 $ 0
Interest Income, Net (81) 868  
Net realized gain (loss) on investments (20,556) 0  
Net realized gain (loss) $ (20,556) $ 0