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Note 6 - Fair Value - Significant Level 3 Fair Value Measurment Inputs (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Investments, fair value	$ 634,259	$ 457,557
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member]
Investments, fair value	$ 605,719	$ 430,417
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Hypothetical Market Yield [Member]
Investments, measurement input	0.03
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | Hypothetical Market Yield [Member]
Investments, measurement input	0.25
Debt [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Hypothetical Market Yield [Member]
Investments, measurement input	0.14	12
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member]
Investments, fair value	$ 3,313	$ 6,900
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Probability Weighting [Member]
Investments, measurement input	0.25
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Minimum [Member] | Probability Weighting [Member]
Investments, measurement input		20
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Maximum [Member] | Probability Weighting [Member]
Investments, measurement input		50
Debt [Member] | Multiple Probability Weighted Cash Flow Model [Member] | Weighted Average [Member] | Probability Weighting [Member]
Investments, measurement input	0.25	33
Warrant [Member] | Black-scholes Valuation Model [Member]
Investments, fair value	$ 21,894	$ 19,837
Warrant [Member] | Black-scholes Valuation Model [Member] | Measurement Input, Price Volatility [Member]
Investments, measurement input	0.25	25
Warrant [Member] | Black-scholes Valuation Model [Member] | Measurement Input, Discount for Lack of Marketability [Member]
Investments, measurement input	0.20	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	980.00
Warrant [Member] | Black-scholes Valuation Model [Member] | Maximum [Member] | Estimated Time to Exit [Member]
Investments, measurement input	4	4
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]
Investments, measurement input	64.53	20.35
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Price Volatility [Member]
Investments, measurement input	0.25	25
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Measurement Input, Discount for Lack of Marketability [Member]
Investments, measurement input	0.20	20
Warrant [Member] | Black-scholes Valuation Model [Member] | Weighted Average [Member] | Estimated Time to Exit [Member]
Investments, measurement input	2	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	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	25
Equity Securities [Member] | Last Equity Financing [Member]
Investments, fair value	$ 2,033	$ 203
Equity Securities [Member] | Last Equity Financing [Member] | Minimum [Member] | Measurement Input, Share Price [Member]
Investments, measurement input	1.00	0.00
Equity Securities [Member] | Last Equity Financing [Member] | Maximum [Member] | Measurement Input, Share Price [Member]
Investments, measurement input	215.03	1.00
Equity Securities [Member] | Last Equity Financing [Member] | Weighted Average [Member] | Measurement Input, Share Price [Member]
Investments, measurement input	30.09	0.41

X

- Definition

Value of input used to measure investment assets.

+ References

No definition available.

+ Details

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X

- 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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