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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments, fair value $ 709,085    
Net unrealized appreciation (depreciation) on investments (18,785) $ (48,780) $ (5,552)
Net realized gain (loss) on investments (34,631) (29,702) (9,484)
Investments, fair value 697,891 709,085  
Interest Income, Operating, Paid in Kind 3,261 8,433 (0)
Investment, Affiliated Issuer, Noncontrolled [Member]      
Investments, fair value 1,132 0  
Purchases 247 11  
Reductions (1,470) (11,000)  
Transfers in/(out) at fair value 0 38,599  
Discount accretion 0 35  
Net unrealized appreciation (depreciation) on investments 8,361 (26,513) 0
Net realized gain (loss) on investments 37 0 30
Investments, fair value 8,307 1,132 0
Interest income 0 1,245 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]      
Investments, fair value 0 0  
Purchases 3 0  
Reductions (40) 0  
Transfers in/(out) at fair value 0 0  
Discount accretion 0 0  
Net unrealized appreciation (depreciation) on investments 0 0  
Net realized gain (loss) on investments 37 0  
Investments, fair value 0 0 0
Interest income 0 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member]      
Investments, fair value 1,132 0  
Purchases 244 11  
Reductions (1,430) (11,000)  
Transfers in/(out) at fair value 0 39,505  
Discount accretion 0 35  
Net unrealized appreciation (depreciation) on investments 8,361 (27,419)  
Net realized gain (loss) on investments 0 0  
Investments, fair value 8,307 1,132 0
Interest income 0 1,245  
Investment, Affiliated Issuer, Noncontrolled [Member] | Cadrenal Therapeutics, Inc. [Member]      
Investments, fair value [1] 0 0  
Purchases [1]   0  
Reductions [1]   0  
Transfers in/(out) at fair value [1]   (906)  
Discount accretion [1]   0  
Net unrealized appreciation (depreciation) on investments [1]   906  
Net realized gain (loss) on investments [1]   0  
Investments, fair value [1]   0 0
Interest income [1]   0  
Investment, Affiliated Issuer, Controlled [Member]      
Investments, fair value 14,223 0  
Purchases 6,654 1,457  
Reductions (592) (516)  
Transfers in/(out) at fair value 22,641 10,734  
Discount accretion 16 6  
Net unrealized appreciation (depreciation) on investments (12,754) 2,222 1,450
Net realized gain (loss) on investments 0 0 (1,150)
Investments, fair value 31,819 14,223 0
Interest income 118 17 0
Interest Income, Operating, Paid in Kind 1,631 320 0
Investment, Affiliated Issuer, Controlled [Member] | Investment [Member]      
Interest income 1,749 337  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member]      
Investments, fair value 7,993 0  
Purchases 3,750 1,311  
Reductions 0 0  
Transfers in/(out) at fair value 0 4,580  
Discount accretion 14 6  
Net unrealized appreciation (depreciation) on investments (12,562) 1,776  
Net realized gain (loss) on investments 0 0  
Investments, fair value 0 7,993 0
Interest income 846 337  
Interest Income, Operating, Paid in Kind 805 320  
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]      
Investments, fair value 6,230 0  
Purchases 227 146  
Reductions (592) (516)  
Transfers in/(out) at fair value 463 6,154  
Discount accretion 0 0  
Net unrealized appreciation (depreciation) on investments (98) 446  
Net realized gain (loss) on investments 0 0  
Investments, fair value 6,230 6,230 $ 0
Interest income 0 0  
Interest Income, Operating, Paid in Kind 0 0  
Investment, Affiliated Issuer, Controlled [Member] | Nexii Building Solutions, Inc [Member]      
Investments, fair value 0    
Purchases 790    
Reductions 0    
Transfers in/(out) at fair value 6,716    
Discount accretion 0    
Net unrealized appreciation (depreciation) on investments 1,041    
Net realized gain (loss) on investments 0    
Investments, fair value 8,547 0  
Interest income 35    
Interest Income, Operating, Paid in Kind 0    
Investment, Affiliated Issuer, Controlled [Member] | Swift Health Systems Inc. [Member]      
Investments, fair value 0    
Purchases 1,887    
Reductions 0    
Transfers in/(out) at fair value 15,462    
Discount accretion 2    
Net unrealized appreciation (depreciation) on investments (1,135)    
Net realized gain (loss) on investments 0    
Investments, fair value 17,042 $ 0  
Interest income 868    
Interest Income, Operating, Paid in Kind $ 826    
[1] As of December 31, 2023, the Company no longer owns 5% of more of the portfolio company.