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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments, fair value     $ 720,026  
Net unrealized appreciation (depreciation) on investments $ (17,518) $ 3,442 (24,448) $ 1,169
Net realized gain (loss) on investments (11,816) (8,585) (28,513) (9,484)
Investments, fair value 729,053   729,053  
Interest Income, Operating, Paid in Kind 3,900 0 6,088 0
Investments, fair value (729,053)   (729,053)  
Evelo Biosciences, Inc. [Member]        
Investments, fair value 8,500   8,500  
Investments, fair value (8,500)   (8,500)  
Investment, Affiliated Issuer, Noncontrolled [Member]        
Investments, fair value 906 0 0 0
Purchases 0 0 0 0
Reductions 0 (30) 0 (30)
Transfers in/(out) at fair value 38,599 0 38,599 0
Discount accretion 35 0 35 0
Net unrealized appreciation (depreciation) on investments (19,055) 0 (18,149) 0
Net realized gain (loss) on investments 0 30 0 30
Investments, fair value 20,485 0 20,485 0
Interest income 1,246 0 1,246 0
Transfers in/(out) at fair value 38,599 0 38,599 0
Investments, fair value (20,485) 0 (20,485) 0
Investment, Affiliated Issuer, Noncontrolled [Member] | MVI (ABC) LLC fka StereoVision, Inc [Member]        
Investments, fair value   0   0
Purchases   0   0
Reductions   (30)   (30)
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   30   30
Investments, fair value   0   0
Interest income   0   0
Transfers in/(out) at fair value   0   0
Investments, fair value   0   0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]        
Investments, fair value 0   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 0   0  
Net realized gain (loss) on investments 0   0  
Investments, fair value 0   0  
Interest income 0   0  
Transfers in/(out) at fair value 0   0  
Investments, fair value 0   0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Cadrenal Therapeutics, Inc. [Member]        
Investments, fair value [1] 906   0  
Purchases [1] 0   0  
Reductions [1] 0   0  
Transfers in/(out) at fair value [1] (906)   (906)  
Discount accretion [1] 0   0  
Net unrealized appreciation (depreciation) on investments [1] 0   906  
Net realized gain (loss) on investments [1] 0   0  
Investments, fair value [1] 0   0  
Interest income [1] 0   0  
Transfers in/(out) at fair value [1] (906)   (906)  
Investments, fair value [1] 0   0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment One [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 7,665   7,665  
Discount accretion 8   8  
Net unrealized appreciation (depreciation) on investments (5,007)   (5,007)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 2,666   2,666  
Interest income 277   277  
Transfers in/(out) at fair value 7,665   7,665  
Investments, fair value (2,666)   (2,666)  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Two [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 11,496   11,496  
Discount accretion 11   11  
Net unrealized appreciation (depreciation) on investments (7,510)   (7,510)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 3,997   3,997  
Interest income 415   415  
Transfers in/(out) at fair value 11,496   11,496  
Investments, fair value (3,997)   (3,997)  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Three [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 4,612   4,612  
Discount accretion 5   5  
Net unrealized appreciation (depreciation) on investments (3,013)   (3,013)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 1,604   1,604  
Interest income 166   166  
Transfers in/(out) at fair value 4,612   4,612  
Investments, fair value (1,604)   (1,604)  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Four [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 4,598   4,598  
Discount accretion 3   3  
Net unrealized appreciation (depreciation) on investments (3,004)   (3,004)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 1,597   1,597  
Interest income 163   163  
Transfers in/(out) at fair value 4,598   4,598  
Investments, fair value (1,597)   (1,597)  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Five [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 3,067   3,067  
Discount accretion 4   4  
Net unrealized appreciation (depreciation) on investments (2,003)   (2,003)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 1,068   1,068  
Interest income 114   114  
Transfers in/(out) at fair value 3,067   3,067  
Investments, fair value (1,068)   (1,068)  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Six [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 3,067   3,067  
Discount accretion 4   4  
Net unrealized appreciation (depreciation) on investments (2,003)   (2,003)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 1,068   1,068  
Interest income 111   111  
Transfers in/(out) at fair value 3,067   3,067  
Investments, fair value (1,068)   (1,068)  
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member] | Investment Seven [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 5,000   5,000  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 3,485   3,485  
Net realized gain (loss) on investments 0   0  
Investments, fair value 8,485   8,485  
Interest income 0   0  
Transfers in/(out) at fair value 5,000   5,000  
Investments, fair value (8,485)   (8,485)  
Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value 0 0 0 0
Purchases 809 0 809 0
Reductions 0 (50) 0 (300)
Transfers in/(out) at fair value 10,818 0 10,818 0
Discount accretion 3 0 3 0
Net unrealized appreciation (depreciation) on investments 1,357 0 1,357 1,450
Net realized gain (loss) on investments 0 50 0 (1,150)
Investments, fair value 13,145 0 13,145 0
Interest income 8 0 8 0
Interest Income, Operating, Paid in Kind 158 0 158 0
Transfers in/(out) at fair value 10,818 0 10,818 0
Investments, fair value (13,145) 0 (13,145) 0
Investment, Affiliated Issuer, Controlled [Member] | Investment [Member]        
Interest income 166   166  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment One [Member]        
Investments, fair value 0   0  
Purchases 59   59  
Reductions 0   0  
Transfers in/(out) at fair value 1,759   1,759  
Discount accretion 2   2  
Net unrealized appreciation (depreciation) on investments 1,080   1,080  
Net realized gain (loss) on investments 0   0  
Investments, fair value 3,005   3,005  
Interest income 111   111  
Interest Income, Operating, Paid in Kind 105   105  
Transfers in/(out) at fair value 1,759   1,759  
Investments, fair value (3,005)   (3,005)  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Two [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 844   844  
Discount accretion 1   1  
Net unrealized appreciation (depreciation) on investments 536   536  
Net realized gain (loss) on investments 0   0  
Investments, fair value 1,434   1,434  
Interest income 55   55  
Interest Income, Operating, Paid in Kind 53   53  
Transfers in/(out) at fair value 844   844  
Investments, fair value (1,434)   (1,434)  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Three [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 2,061   2,061  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 0   0  
Net realized gain (loss) on investments 0   0  
Investments, fair value 2,061   2,061  
Interest income 0   0  
Interest Income, Operating, Paid in Kind 0   0  
Transfers in/(out) at fair value 2,061   2,061  
Investments, fair value (2,061)   (2,061)  
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member] | Investment Four [Member]        
Investments, fair value 0   0  
Purchases 750   750  
Reductions 0   0  
Transfers in/(out) at fair value 0   0  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments (259)   (259)  
Net realized gain (loss) on investments 0   0  
Investments, fair value 491   491  
Interest income 0   0  
Interest Income, Operating, Paid in Kind 0   0  
Transfers in/(out) at fair value 0   0  
Investments, fair value (491)   (491)  
Investment, Affiliated Issuer, Controlled [Member] | HESP LLC [Member]        
Investments, fair value   0   0
Purchases   0   0
Reductions   (50)   (300)
Transfers in/(out) at fair value   0   0
Discount accretion   0   0
Net unrealized appreciation (depreciation) on investments   0   1,450
Net realized gain (loss) on investments   50   (1,150)
Investments, fair value   0   0
Interest income   0   0
Transfers in/(out) at fair value   0   0
Investments, fair value   $ 0   $ 0
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]        
Investments, fair value 0   0  
Purchases 0   0  
Reductions 0   0  
Transfers in/(out) at fair value 6,154   6,154  
Discount accretion 0   0  
Net unrealized appreciation (depreciation) on investments 0   0  
Net realized gain (loss) on investments 0   0  
Investments, fair value 6,154   6,154  
Interest income 0   0  
Interest Income, Operating, Paid in Kind 0   0  
Transfers in/(out) at fair value 6,154   6,154  
Investments, fair value $ (6,154)   $ (6,154)  
[1] As of September 30, 2023, the Company no longer owns 5% or more of the portfolio company.