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Note 5 - Transactions With Affiliated Companies - Investments in Affiliated Companies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Investments, fair value $ 720,026  
Unrealized Gain (Loss) on Investments (7,537) $ (2,237)
Net realized gain (loss) on investments (168) 30
Investments, fair value 715,312  
Investment, Affiliated Issuer, Noncontrolled [Member]    
Investments, fair value 0  
Purchases 0  
Principal payments 0  
Transfers in/(out) at fair value 0  
Discount accretion 0  
Unrealized Gain (Loss) on Investments 846 0
Net realized gain (loss) on investments 0  
Investments, fair value 846  
Interest income 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Cadrenal Therapeutics, Inc. [Member]    
Investments, fair value 0  
Purchases 0  
Principal payments 0  
Transfers in/(out) at fair value 0  
Discount accretion 0  
Unrealized Gain (Loss) on Investments 846  
Net realized gain (loss) on investments 0  
Investments, fair value 846  
Interest income 0  
Investment, Affiliated Issuer, Controlled [Member]    
Investments, fair value   0
Purchases   0
Principal payments   (50)
Transfers in/(out) at fair value   0
Discount accretion   0
Unrealized Gain (Loss) on Investments $ 0 50
Net realized gain (loss) on investments   0
Investments, fair value   0
Interest income   0
Investment, Affiliated Issuer, Controlled [Member] | HESP LLC [Member]    
Investments, fair value   0
Purchases   0
Principal payments   (50)
Transfers in/(out) at fair value   0
Discount accretion   0
Unrealized Gain (Loss) on Investments   50
Net realized gain (loss) on investments   0
Investments, fair value   0
Interest income   $ 0