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Note 6 - Fair Value - Assets at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Recurring [Member]    
Investments, fair value $ 684,000 $ 709,085
Fair Value, Recurring [Member] | Debt [Member]    
Investments, fair value 633,284 670,172
Fair Value, Recurring [Member] | Warrant [Member]    
Investments, fair value 18,735 24,594
Fair Value, Recurring [Member] | Other Investments [Member]    
Investments, fair value 17,944 6,430
Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments, fair value 14,037 7,889
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Investments, fair value 560 608
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Debt [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Warrant [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Other Investments [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments, fair value 560 608
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Investments, fair value 430 1,619
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Debt [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Warrant [Member]    
Investments, fair value 430 1,619
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Other Investments [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 3 [Member]    
Investments, fair value 683,010 706,858
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Investments, fair value 683,010 706,858
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Debt [Member]    
Investments, fair value 633,284 670,172
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Warrant [Member]    
Investments, fair value 18,305 22,975
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Investments [Member]    
Investments, fair value 17,944 6,430
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments, fair value $ 13,477 $ 7,281