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Note 5 - Transactions With Affiliated Companies - Investments in Affiliated Companies (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, fair value     $ 709,085  
Net unrealized appreciation (depreciation) on investments $ (24,511) $ 608 (28,471) $ (6,929)
Net realized gain (loss) on investments 2,464 (16,529) 2,472 (16,697)
Investments, fair value 646,862   646,862  
Interest Income, Operating, Paid in Kind     1,737 2,154
Investment, Affiliated Issuer, Noncontrolled [Member]        
Investments, fair value 12,577 846 1,132 0
Purchases 92 0 107 0
Reductions (40) 0 (40) 0
Transfers in/(out) at fair value 0 0 0 0
Discount accretion 0 0 0 0
Net unrealized appreciation (depreciation) on investments 3,178 60 14,611 906
Net realized gain (loss) on investments 40 0 37 0
Investments, fair value 15,847 906 15,847 906
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]        
Investments, fair value 0   0  
Purchases 0   3  
Reductions (40)   (40)  
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 40   37  
Investments, fair value 0   0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Cadrenal Therapeutics, Inc. [Member]        
Investments, fair value   846   0
Purchases   0   0
Reductions   0   0
Transfers in/(out) at fair value   0   0
Discount accretion   0   0
Net unrealized appreciation (depreciation) on investments   60   906
Net realized gain (loss) on investments   0   0
Investments, fair value   906   906
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment One [Member]        
Investments, fair value 2,790   222  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 713   3,281  
Net realized gain (loss) on investments 0   0  
Investments, fair value 3,503   3,503  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Two [Member]        
Investments, fair value 4,207   336  
Purchases 92   104  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 1,041   4,900  
Net realized gain (loss) on investments 0   0  
Investments, fair value 5,340   5,340  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Three [Member]        
Investments, fair value 1,674   133  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 427   1,968  
Net realized gain (loss) on investments 0   0  
Investments, fair value 2,101   2,101  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Four [Member]        
Investments, fair value 1,674   133  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 427   1,968  
Net realized gain (loss) on investments 0   0  
Investments, fair value 2,101   2,101  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Five [Member]        
Investments, fair value 1,116   88  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 285   1,313  
Net realized gain (loss) on investments 0   0  
Investments, fair value 1,401   1,401  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Six [Member]        
Investments, fair value 1,116   88  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 285   1,313  
Net realized gain (loss) on investments 0   0  
Investments, fair value 1,401   1,401  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Seven [Member]        
Investments, fair value     132  
Purchases     0  
Reductions     0  
Transfers in/(out) at fair value     0  
Discount accretion     0  
Net unrealized appreciation (depreciation) on investments     (132)  
Net realized gain (loss) on investments     0  
Investments, fair value 0   0  
Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value 13,644   14,223  
Purchases 1,500   2,477  
Reductions 0   (547)  
Transfers in/(out) at fair value 463   463  
Discount accretion 3   7  
Net unrealized appreciation (depreciation) on investments (4,402) 0 (5,581) 0
Net realized gain (loss) on investments 0   0  
Investments, fair value 11,386   11,386  
Interest Income, Operating, Paid in Kind 178   344  
Interest income 188 $ 0 365 $ 0
Investment, Affiliated Issuer, Controlled [Member] | Investment [Member]        
Interest income 188   365  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment One [Member]        
Investments, fair value 3,455   3,339  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 2   4  
Net unrealized appreciation (depreciation) on investments (406)   (403)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 3,166   3,166  
Interest Income, Operating, Paid in Kind 115   226  
Interest income 120   236  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Two [Member]        
Investments, fair value 1,688   1,630  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 1   3  
Net unrealized appreciation (depreciation) on investments (197)   (196)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 1,549   1,549  
Interest Income, Operating, Paid in Kind 57   112  
Interest income 62   123  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Three [Member]        
Investments, fair value 0   0  
Purchases 500   500  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments (85)   (85)  
Net realized gain (loss) on investments 0    
Investments, fair value 420   420  
Interest Income, Operating, Paid in Kind 5   5  
Interest income 5   5  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Four [Member]        
Investments, fair value 0   0  
Purchases 500   500  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments (86)   (86)  
Net realized gain (loss) on investments 0    
Investments, fair value 415   415  
Interest Income, Operating, Paid in Kind 1   1  
Interest income 1   1  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Five [Member]        
Investments, fair value 2,656   3,024  
Purchases 500   1,250  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments (3,156)   (4,274)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 0   0  
Interest Income, Operating, Paid in Kind 0   0  
Interest income 0   0  
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]        
Investments, fair value 5,845   6,230  
Purchases 0   227  
Reductions 0   (547)  
Transfers in/(out) at fair value 463   463  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments (472)   (537)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 5,836   5,836  
Interest Income, Operating, Paid in Kind 0   0  
Interest income $ 0   $ 0