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Note 21 - Fair Value of Financial Instruments - Fair Value Measurement Inputs and Valuation Techniques (Details)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Limited liability investments, at fair value	$ 8,291,000	$ 13,863,000
Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative - trust preferred debt repurchase options		19,000,000.0
Limited Liability Investments [Member]
Limited liability investments, at fair value	11,733,000	17,059,000
Fair Value, Inputs, Level 3 [Member] | Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative - trust preferred debt repurchase options		19,034
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Limited Liability Investments [Member]
Limited liability investments, at fair value	$ 3,442,000	$ 3,196,000
Valuation Multiples [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Cap Rate [Member] | Minimum [Member]
Limited liability investments, measurement input	1.0	1.0
Valuation Multiples [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Cap Rate [Member] | Maximum [Member]
Limited liability investments, measurement input		9.0
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member]
Contingent consideration, at fair value	$ 3,218,000	$ 3,218,000
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member]
Contingent consideration, measurement input	8.25	0.0825
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Risk Free Interest Rate [Member]
Contingent consideration, measurement input	4.44	0.0444
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Price Volatility [Member]
Contingent consideration, measurement input		0.130
Binomial Lattice Option Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Credit Spread [Member] | Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative - trust preferred debt repurchase options, measurement input		0.0895
Binomial Lattice Option Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Interest Rate Volatility [Member] | Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative - trust preferred debt repurchase options, measurement input		0.023
Binomial Lattice Option Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Debt Coupon Interest Rate [Member] | Minimum [Member] | Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative - trust preferred debt repurchase options, measurement input		0.0872
Binomial Lattice Option Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Debt Coupon Interest Rate [Member] | Maximum [Member] | Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative - trust preferred debt repurchase options, measurement input	13.00	0.0887
Binomial Lattice Option Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Expected Term [Member] | Minimum [Member] | Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative - trust preferred debt repurchase options, measurement input		10.4
Binomial Lattice Option Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Expected Term [Member] | Maximum [Member] | Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative - trust preferred debt repurchase options, measurement input		10.59

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