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Note 6 - Fair Value - Assets at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Recurring [Member]    
Investments, fair value $ 676,711 $ 647,244
Fair Value, Recurring [Member] | Debt [Member]    
Investments, fair value 647,999 596,025
Fair Value, Recurring [Member] | Warrant [Member]    
Investments, fair value 16,703 16,648
Fair Value, Recurring [Member] | Other Investment [Member]    
Investments, fair value 4,037 3,444
Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments, fair value 7,757 31,127
Fair Value, Recurring [Member] | Joint Venture Investment Funds [Member]    
Investments, fair value [1] 215  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Investments, fair value 1,875 3,988
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 Investment [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments, fair value 1,875 3,988
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Joint Venture Investment Funds [Member]    
Investments, fair value [1] 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Investments, fair value 2,590 1,916
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 2,590 1,916
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Other Investment [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 2 [Member] | Fair Value, Recurring [Member] | Joint Venture Investment Funds [Member]    
Investments, fair value [1] 0  
Fair Value, Inputs, Level 3 [Member]    
Investments, fair value 672,031 641,340
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Investments, fair value 672,031 641,340
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Debt [Member]    
Investments, fair value 647,999 596,025
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Warrant [Member]    
Investments, fair value 14,113 14,732
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Investment [Member]    
Investments, fair value 4,037 3,444
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments, fair value 5,882 $ 27,139
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Joint Venture Investment Funds [Member]    
Investments, fair value [1] $ 0  
[1] The fair value of the Company's investment in the RoHo Joint Venture is determined using the net asset value of the Company's ownership interest in member's capital.