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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investments, fair value $ 697,891  
Net unrealized appreciation (depreciation) on investments (32,156) $ (3,960)
Net realized gain (loss) 1 8
Investments, fair value 689,553  
Interest Income, Operating, Paid in Kind 285 1,382
Investment, Affiliated Issuer, Noncontrolled [Member]    
Investments, fair value 8,307 1,132
Purchases 2 15
Reductions 0 0
Transfers in/(out) at fair value 0 0
Discount accretion 0 0
Net unrealized appreciation (depreciation) on investments (2) 11,433
Net realized gain (loss) 0 (3)
Investments, fair value 8,307 12,577
Interest Income, Net 0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]    
Investments, fair value 0 0
Purchases 0 3
Reductions 0 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) 0 (3)
Investments, fair value 0 0
Interest Income, Net 0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member]    
Investments, fair value 8,307 1,132
Purchases 2 12
Reductions 0 0
Transfers in/(out) at fair value 0 0
Discount accretion 0 0
Net unrealized appreciation (depreciation) on investments (2) 11,433
Net realized gain (loss) 0 0
Investments, fair value 8,307 12,577
Interest Income, Net 0 0
Investment, Affiliated Issuer, Controlled [Member]    
Investments, fair value 31,819 14,223
Purchases 2,950 977
Reductions 0 (547)
Transfers in/(out) at fair value 0 0
Discount accretion 9 4
Net unrealized appreciation (depreciation) on investments (20,117) (1,179)
Net realized gain (loss) 0 0
Investments, fair value 14,869 13,644
Interest Income, Net (61) 177
Interest Income, Operating, Paid in Kind 208 166
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member]    
Investments, fair value 0 7,993
Purchases 941 750
Reductions 0 0
Transfers in/(out) at fair value 0 0
Discount accretion 0 4
Net unrealized appreciation (depreciation) on investments (62) (1,114)
Net realized gain (loss) 0 0
Investments, fair value 879 7,799
Interest Income, Net 0 177
Interest Income, Operating, Paid in Kind 0 166
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]    
Investments, fair value 6,230 6,230
Purchases 0 227
Reductions 0 (547)
Transfers in/(out) at fair value 0 0
Discount accretion 0 0
Net unrealized appreciation (depreciation) on investments (940) (65)
Net realized gain (loss) 0 0
Investments, fair value 5,290 5,845
Interest Income, Net 0 0
Interest Income, Operating, Paid in Kind 0 $ 0
Investment, Affiliated Issuer, Controlled [Member] | Nexii Building Solutions, Inc [Member]    
Investments, fair value 8,547  
Purchases 0  
Reductions 0  
Transfers in/(out) at fair value 0  
Discount accretion 0  
Net unrealized appreciation (depreciation) on investments 153  
Net realized gain (loss) 0  
Investments, fair value 8,700  
Interest Income, Net 20  
Interest Income, Operating, Paid in Kind 0  
Investment, Affiliated Issuer, Controlled [Member] | Swift Health Systems Inc. [Member]    
Investments, fair value 17,042  
Purchases 2,009  
Reductions 0  
Transfers in/(out) at fair value 0  
Discount accretion 9  
Net unrealized appreciation (depreciation) on investments (19,268)  
Net realized gain (loss) 0  
Investments, fair value 0  
Interest Income, Net (81)  
Interest Income, Operating, Paid in Kind $ 208