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Note 22 - Equity-based Compensation (Details Textual) - USD ($) $ in Thousands			12 Months Ended
	Apr. 01, 2021	Mar. 12, 2012	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 01, 2021	Apr. 07, 2020
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 16,800
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 8 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)			0
Revenue Share Arrangement, Percentage of Revenues Received		8.00%				7.35%
Infrastructure Finance Business [Member] | Maximum [Member]
Revenue Share Arrangement, Cumulative Revenue		$ 20,000
Revenue Share Arrangement, Revenue Per Year		$ 2,000
Managing Member of IIFC [Member]
Revenue Share Arrangement, Cumulative Revenue			$ 3,841
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)		50,000
Managing Member of IIFC [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		33.30%
Share-based Compensation Arrangement by Share -based Payment Award, Award Vesting Rights, Cumulative Revenue Measurement		$ 6,000
Managing Member of IIFC [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		33.30%
Share-based Compensation Arrangement by Share -based Payment Award, Award Vesting Rights, Cumulative Revenue Measurement		$ 12,000
Managing Member of IIFC [Member] | Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		33.30%
Share-based Compensation Arrangement by Share -based Payment Award, Award Vesting Rights, Cumulative Revenue Measurement		$ 18,000
Membership Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 23,527	$ 13,361	$ 0
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)							600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			195,924				200,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	600,000
Long Term Incentive Plan 2010 and AFN 2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			0
Equity Incentive Plan 2010 and 2006 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 1,999	$ 290	$ 462

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