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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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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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