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Note 6 - Fair Value - Significant Level 3 Fair Value Measurment Inputs (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)
Investments, fair value	$ 716,319		$ 457,557
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member]
Investments, fair value	$ 669,617		$ 430,417
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Hypothetical Market Yield [Member]
Investments, measurement input	0.03		0.03
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | Hypothetical Market Yield [Member]
Investments, measurement input	0.22	[1]	0.23
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Hypothetical Market Yield [Member]
Investments, measurement input	0.14		0.12
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member]
Investments, fair value	$ 16,545		$ 6,900
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Minimum [Member] | Probability Weighting [Member]
Investments, measurement input	0.10		0.20
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Maximum [Member] | Probability Weighting [Member]
Investments, measurement input	0.75	[1]	0.50
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Weighted Average [Member] | Probability Weighting [Member]
Investments, measurement input	0.31		0.33
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	168.93
Warrant [Member] | Black-scholes Valuation Model [Member]
Investments, fair value	$ 26,145		$ 19,837
Warrant [Member] | Black-scholes Valuation Model [Member] | Measurement Input, Price Volatility [Member]
Investments, measurement input	0.28		0.25
Warrant [Member] | Black-scholes Valuation Model [Member] | Measurement Input, Discount for Lack of Marketability [Member]
Investments, measurement input	0.20		0.20
Warrant [Member] | Black-scholes Valuation Model [Member] | Minimum [Member] | Measurement Input, Share Price [Member]
Investments, measurement input	0.00		0.00
Warrant [Member] | Black-scholes Valuation Model [Member] | Minimum [Member] | Estimated Time to Exit [Member]
Investments, measurement input	1		1
Warrant [Member] | Black-scholes Valuation Model [Member] | Maximum [Member] | Measurement Input, Share Price [Member]
Investments, measurement input	1,899	[1]	980.00
Warrant [Member] | Black-scholes Valuation Model [Member] | Maximum [Member] | Estimated Time to Exit [Member]
Investments, measurement input	5	[1]	4
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]
Investments, measurement input	58.52		20.35
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Price Volatility [Member]
Investments, measurement input	0.28		0.25
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Discount for Lack of Marketability [Member]
Investments, measurement input	0.20		0.20
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Estimated Time to Exit [Member]
Investments, measurement input	3		2
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member]
Investments, fair value	$ 1,300		$ 200
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] | Minimum [Member] | Probability Weighting [Member]
Investments, measurement input			0
Other Investments [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Maximum [Member] | Probability Weighting [Member]
Investments, measurement input			1
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	0.25		0.25
Equity Securities [Member] | Last Equity Financing [Member]
Investments, fair value	$ 2,416		$ 203
Equity Securities [Member] | Last Equity Financing [Member] | Minimum [Member] | Measurement Input, Share Price [Member]
Investments, measurement input			0.00
Equity Securities [Member] | Last Equity Financing [Member] | Maximum [Member] | Measurement Input, Share Price [Member]
Investments, measurement input			1.00
Equity Securities [Member] | Last Equity Financing [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]
Investments, measurement input	26.93		0.41
[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.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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