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Note 22 - Equity-based Compensation (Details Textual) - USD ($)		12 Months Ended
	Mar. 12, 2012	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 07, 2020
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 7,360
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		3 years 36 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%
Infrastructure Finance Business [Member] | Maximum [Member]
Revenue Share Arrangement, Cumulative Revenue	$ 20,000,000
Revenue Share Arrangement, Revenue Per Year	$ 2,000,000
Managing Member of IIFC [Member]
Revenue Share Arrangement, Cumulative Revenue		$ 3,178,000
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	$ 6,000,000
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	$ 12,000,000
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	$ 18,000,000
Membership Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 13,361,000	$ 0	$ 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)					200,000
Long Term Incentive Plan 2010 and AFN 2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (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		$ 290,000	$ 462,000	$ 574,000

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