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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments, fair value $ 720,026    
Net unrealized appreciation (depreciation) on investments (48,780) $ (5,552) $ 3,205
Net realized gain (loss) on investments (29,702) (9,484) (3,248)
Investments, fair value 709,085 720,026  
Interest Income, Operating, Paid in Kind 8,433 (0) 0
Investments, fair value (709,085) (720,026)  
Investment, Affiliated Issuer, Noncontrolled [Member]      
Investments, fair value 0 0  
Purchases 11 0  
Reductions (11,000) (30)  
Transfers in/(out) at fair value 38,599 0  
Discount accretion 35 0  
Net unrealized appreciation (depreciation) on investments (26,513) 0 (848)
Net realized gain (loss) on investments 0 30 (390)
Investments, fair value 1,132 0 0
Interest income 1,245 0 252
Transfers in/(out) at fair value 38,599 0  
Investments, fair value (1,132) 0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | MVI (ABC) LLC fka StereoVision, Inc [Member]      
Investments, fair value 0 0  
Purchases   0  
Reductions   (30)  
Transfers in/(out) at fair value   0  
Discount accretion   0  
Net unrealized appreciation (depreciation) on investments   0  
Net realized gain (loss) on investments   30  
Investments, fair value   0 0
Interest income   0  
Transfers in/(out) at fair value   0  
Investments, fair value   0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]      
Investments, fair value 0    
Purchases 0    
Reductions 0    
Transfers in/(out) at fair value 0    
Discount accretion 0    
Net unrealized appreciation (depreciation) on investments 0    
Net realized gain (loss) on investments 0    
Investments, fair value 0 0  
Interest income 0    
Transfers in/(out) at fair value 0    
Investments, fair value 0 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Cadrenal Therapeutics, Inc. [Member]      
Investments, fair value [1] 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    
Transfers in/(out) at fair value [1] (906)    
Investments, fair value [1] 0 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment One [Member]      
Investments, fair value 0    
Purchases 0    
Reductions (2,443)    
Transfers in/(out) at fair value 7,663    
Discount accretion 8    
Net unrealized appreciation (depreciation) on investments (5,006)    
Net realized gain (loss) on investments 0    
Investments, fair value 222 0  
Interest income 277    
Transfers in/(out) at fair value 7,663    
Investments, fair value (222) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Two [Member]      
Investments, fair value 0    
Purchases 11    
Reductions (3,667)    
Transfers in/(out) at fair value 11,509    
Discount accretion 11    
Net unrealized appreciation (depreciation) on investments (7,528)    
Net realized gain (loss) on investments 0    
Investments, fair value 336 0  
Interest income 414    
Transfers in/(out) at fair value 11,509    
Investments, fair value (336) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Three [Member]      
Investments, fair value 0    
Purchases 0    
Reductions (1,467)    
Transfers in/(out) at fair value 4,601    
Discount accretion 5    
Net unrealized appreciation (depreciation) on investments (3,006)    
Net realized gain (loss) on investments 0    
Investments, fair value 133 0  
Interest income 166    
Transfers in/(out) at fair value 4,601    
Investments, fair value (133) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Four [Member]      
Investments, fair value 0    
Purchases 0    
Reductions (1,467)    
Transfers in/(out) at fair value 4,598    
Discount accretion 3    
Net unrealized appreciation (depreciation) on investments (3,001)    
Net realized gain (loss) on investments 0    
Investments, fair value 133 0  
Interest income 163    
Transfers in/(out) at fair value 4,598    
Investments, fair value (133) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Five [Member]      
Investments, fair value 0    
Purchases 0    
Reductions (978)    
Transfers in/(out) at fair value 3,067    
Discount accretion 4    
Net unrealized appreciation (depreciation) on investments (2,005)    
Net realized gain (loss) on investments 0    
Investments, fair value 88 0  
Interest income 114    
Transfers in/(out) at fair value 3,067    
Investments, fair value (88) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Six [Member]      
Investments, fair value 0    
Purchases 0    
Reductions (978)    
Transfers in/(out) at fair value 3,067    
Discount accretion 4    
Net unrealized appreciation (depreciation) on investments (2,005)    
Net realized gain (loss) on investments 0    
Investments, fair value 88 0  
Interest income 111    
Transfers in/(out) at fair value 3,067    
Investments, fair value (88) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Seven [Member]      
Investments, fair value 0    
Purchases 0    
Reductions 0    
Transfers in/(out) at fair value 5,000    
Discount accretion 0    
Net unrealized appreciation (depreciation) on investments (4,868)    
Net realized gain (loss) on investments 0    
Investments, fair value 132 0  
Interest income 0    
Transfers in/(out) at fair value 5,000    
Investments, fair value (132) 0  
Investment, Affiliated Issuer, Controlled [Member]      
Investments, fair value 0 0  
Purchases 1,457 0  
Reductions (516) (300)  
Transfers in/(out) at fair value 10,734 0  
Discount accretion 6 0  
Net unrealized appreciation (depreciation) on investments 2,222 1,450 (1,450)
Net realized gain (loss) on investments 0 (1,150) 0
Investments, fair value 14,223 0 0
Interest income 17 0 0
Interest Income, Operating, Paid in Kind 320 0 0
Transfers in/(out) at fair value 10,734 0  
Investments, fair value (14,223) 0 0
Investment, Affiliated Issuer, Controlled [Member] | Investment [Member]      
Interest income 337    
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment One [Member]      
Investments, fair value 0    
Purchases 61    
Reductions 0    
Transfers in/(out) at fair value 1,675    
Discount accretion 5    
Net unrealized appreciation (depreciation) on investments 1,385    
Net realized gain (loss) on investments 0    
Investments, fair value 3,339 0  
Interest income 225    
Interest Income, Operating, Paid in Kind 213    
Transfers in/(out) at fair value 1,675    
Investments, fair value (3,339) 0  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Two [Member]      
Investments, fair value 0    
Purchases 0    
Reductions 0    
Transfers in/(out) at fair value 844    
Discount accretion 1    
Net unrealized appreciation (depreciation) on investments 678    
Net realized gain (loss) on investments 0    
Investments, fair value 1,630 0  
Interest income 112    
Interest Income, Operating, Paid in Kind 107    
Transfers in/(out) at fair value 844    
Investments, fair value (1,630) 0  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Three [Member]      
Investments, fair value 0    
Purchases 1,250    
Reductions 0    
Transfers in/(out) at fair value 2,061    
Discount accretion 0    
Net unrealized appreciation (depreciation) on investments (287)    
Net realized gain (loss) on investments 0    
Investments, fair value 3,024 0  
Interest income 0    
Interest Income, Operating, Paid in Kind 0    
Transfers in/(out) at fair value 2,061    
Investments, fair value (3,024) 0  
Investment, Affiliated Issuer, Controlled [Member] | HESP LLC [Member]      
Investments, fair value 0 0  
Purchases   0  
Reductions   (300)  
Transfers in/(out) at fair value   0  
Discount accretion   0  
Net unrealized appreciation (depreciation) on investments   1,450  
Net realized gain (loss) on investments   (1,150)  
Investments, fair value   0 0
Interest income   0  
Transfers in/(out) at fair value   0  
Investments, fair value   0 $ 0
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]      
Investments, fair value 0    
Purchases 146    
Reductions (516)    
Transfers in/(out) at fair value 6,154    
Discount accretion 0    
Net unrealized appreciation (depreciation) on investments 446    
Net realized gain (loss) on investments 0    
Investments, fair value 6,230 0  
Interest income 0    
Interest Income, Operating, Paid in Kind 0    
Transfers in/(out) at fair value 6,154    
Investments, fair value $ (6,230) $ 0  
[1] As of December 31, 2023, the Company no longer owns 5% of more of the portfolio company.