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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Investments, fair value     $ 720,026  
Unrealized Gain (Loss) on Investments $ 608 $ (36) (6,929) $ (2,273)
Net realized gain (loss) on investments (16,529) (929) (16,697) (899)
Investments, fair value 715,391   715,391  
Investment, Affiliated Issuer, Noncontrolled [Member]        
Investments, fair value 846   0  
Purchases 0   0  
Principal payments 0   0  
Transfers in/(out) at fair value 0   0  
Dividends declared 0      
Unrealized Gain (Loss) on Investments 60 0 906 0
Net realized gain (loss) on investments 0   0  
Investments, fair value 906   906  
Discount accretion     0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Cadrenal Therapeutics, Inc. [Member]        
Investments, fair value 846   0  
Purchases 0   0  
Principal payments 0   0  
Transfers in/(out) at fair value 0   0  
Dividends declared 0      
Unrealized Gain (Loss) on Investments 60   906  
Net realized gain (loss) on investments 0   0  
Investments, fair value 906   906  
Discount accretion     0  
Investment, Affiliated Issuer, Controlled [Member]        
Investments, fair value   0   0
Purchases   0   0
Principal payments   (200)   (250)
Transfers in/(out) at fair value   0   0
Dividends declared   0    
Unrealized Gain (Loss) on Investments 0 1,400 0 1,450
Net realized gain (loss) on investments $ 0 (1,200) $ 0 (1,200)
Investments, fair value   0   0
Discount accretion       0
Investment, Affiliated Issuer, Controlled [Member] | HESP LLC [Member]        
Investments, fair value   0   0
Purchases   0   0
Principal payments   (200)   (250)
Transfers in/(out) at fair value   0   0
Dividends declared   0    
Unrealized Gain (Loss) on Investments   1,400   1,450
Net realized gain (loss) on investments   (1,200)   (1,200)
Investments, fair value   $ 0   0
Discount accretion       $ 0