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Note 6 - Fair Value - Significant Level 3 Fair Value Measurement Inputs (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands		Jun. 30, 2023 USD ($)		Dec. 31, 2022 USD ($)
Investments, fair value		$ 713,244		$ 716,319
Investments, measurement input		100
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member]
Investments, fair value		$ 611,524		$ 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		0.24	[1]	0.22
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Hypothetical Market Yield [Member]
Investments, measurement input		0.14		0.14	[1]
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member]
Investments, fair value		$ 71,785		$ 16,545
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Minimum [Member] | Probability Weighting [Member]
Investments, measurement input		0.05		0.10
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Maximum [Member] | Probability Weighting [Member]
Investments, measurement input		1	[1]	0.75
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Weighted Average [Member] | Probability Weighting [Member]
Investments, measurement input		0.50		0.31	[1]
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				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				1.899
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]			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		$ 24,314
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		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]	1,899
Warrant [Member] | Black-scholes Valuation Model [Member] | Maximum [Member] | Estimated Time to Exit [Member]
Investments, measurement input	[1]	5
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]
Investments, measurement input		59.21
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Price Volatility [Member]
Investments, measurement input		0.28
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Estimated Time to Exit [Member]
Investments, measurement input		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		0.25
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member]
Investments, fair value		$ 1,300		$ 1,300
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Probability Weighting [Member]
Investments, measurement input				100
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]			100
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Weighted Average [Member] | Measurement Input, Discount Rate [Member]
Investments, measurement input		0.25		0.25	[1]
Equity Securities [Member] | Last Equity Financing [Member]
Investments, fair value		$ 4,259		$ 2,416
Equity Securities [Member] | Last Equity Financing [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]
Investments, measurement input		27.56		26.93	[1]
[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.

X

- Definition

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+ References

No definition available.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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