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Note 6 - Fair Value - Significant Level 3 Fair Value Measurement Inputs (Details) - Fair Value, Inputs, Level 3 [Member]
$ in Thousands
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Investments, fair value $ 719,135 $ 716,319
Investments, measurement input [1] 0.83  
Minimum [Member]    
Investments, measurement input 0.30  
Maximum [Member]    
Investments, measurement input 1  
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member]    
Investments, fair value $ 607,193 $ 669,617
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Hypothetical Market Yield [Member]    
Investments, measurement input 0.11 0.03
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | Hypothetical Market Yield [Member]    
Investments, measurement input 0.20 0.22
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Hypothetical Market Yield [Member]    
Investments, measurement input [1] 0.14 0.14
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member]    
Investments, fair value $ 72,645 $ 16,545
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Minimum [Member] | Probability Weighting [Member]    
Investments, measurement input 0.20 0.10
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Maximum [Member] | Probability Weighting [Member]    
Investments, measurement input 1 0.75
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Weighted Average [Member] | Probability Weighting [Member]    
Investments, measurement input [1] 0.50 0.31
Debt [Member] | Black-scholes Valuation Model [Member]    
Investments, fair value   $ 26,145
Debt [Member] | Black-scholes Valuation Model [Member] | Measurement Input, Price Volatility [Member]    
Investments, measurement input   0.28
Debt [Member] | Black-scholes Valuation Model [Member] | Measurement Input, Discount for Lack of Marketability [Member]    
Investments, measurement input   0.20
Debt [Member] | Black-scholes Valuation Model [Member] | Minimum [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input   0.00
Debt [Member] | Black-scholes Valuation Model [Member] | Minimum [Member] | Estimated Time to Exit [Member]    
Investments, measurement input   1
Debt [Member] | Black-scholes Valuation Model [Member] | Maximum [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input   1.89
Debt [Member] | Black-scholes Valuation Model [Member] | Maximum [Member] | Estimated Time to Exit [Member]    
Investments, measurement input   5
Debt [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input [1]   58.52
Debt [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Price Volatility [Member]    
Investments, measurement input [1]   0.28
Debt [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Discount for Lack of Marketability [Member]    
Investments, measurement input [1]   0.20
Debt [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Estimated Time to Exit [Member]    
Investments, measurement input [1]   3
Debt [Member] | Convertible Note Analysis [Member]    
Investments, fair value   $ 296
Debt [Member] | Convertible Note Analysis [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input   168.93
Debt [Member] | Convertible Note Analysis [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input [1]   168.93
Warrant [Member] | Black-scholes Valuation Model [Member]    
Investments, fair value $ 25,171  
Warrant [Member] | Black-scholes Valuation Model [Member] | Measurement Input, Price Volatility [Member]    
Investments, measurement input 0.28  
Warrant [Member] | Black-scholes Valuation Model [Member] | Measurement Input, Discount for Lack of Marketability [Member]    
Investments, measurement input 0.20  
Warrant [Member] | Black-scholes Valuation Model [Member] | Minimum [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input 0.00  
Warrant [Member] | Black-scholes Valuation Model [Member] | Minimum [Member] | Measurement Input, Discount for Lack of Marketability [Member]    
Investments, measurement input [1] 0.20  
Warrant [Member] | Black-scholes Valuation Model [Member] | Minimum [Member] | Estimated Time to Exit [Member]    
Investments, measurement input 1  
Warrant [Member] | Black-scholes Valuation Model [Member] | Maximum [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input 1,899  
Warrant [Member] | Black-scholes Valuation Model [Member] | Maximum [Member] | Estimated Time to Exit [Member]    
Investments, measurement input 5  
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input [1] 58.11  
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Price Volatility [Member]    
Investments, measurement input [1] 0.28  
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Estimated Time to Exit [Member]    
Investments, measurement input [1] 3  
Warrant [Member] | Expected Proceeds [Member]    
Investments, fair value $ 62  
Warrant [Member] | Expected Proceeds [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input 0.25  
Warrant [Member] | Expected Proceeds [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input [1] 0.25  
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member]    
Investments, fair value $ 7,254 $ 1,300
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Probability Weighting [Member]    
Investments, measurement input   1
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Measurement Input, Discount Rate [Member]    
Investments, measurement input 0.25 0.25
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Weighted Average [Member] | Probability Weighting [Member]    
Investments, measurement input [1]   1
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Weighted Average [Member] | Measurement Input, Discount Rate [Member]    
Investments, measurement input [1] 0.25 0.25
Equity Securities [Member] | Last Equity Financing [Member]    
Investments, fair value $ 6,810 $ 2,416
Equity Securities [Member] | Last Equity Financing [Member] | Minimum [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input 0.03  
Equity Securities [Member] | Last Equity Financing [Member] | Maximum [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input 215.03  
Equity Securities [Member] | Last Equity Financing [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]    
Investments, measurement input [1] 18.30 26.93
[1] Weighted average is calculated by multiplying (a) the unobservable input for each investment in the investment type by (b) (1) the fair value of the related investment in the investment type divided by (2) the total fair value of the investment type.