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Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 29, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Operating Lease, Right-of-Use Asset | $ 6,063 | $ 7,155 |  |  |
Operating Lease, Liability, Total | 6,531 | 7,693 |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | (20,341) | (34,519) |  |  |
Other Receivables | 3,929 | 46,625 |  |  |
Debt Instrument, Fair Value Disclosure, Total | 62,496 | $ 58,635 |  |  |
Collateralized Debt Obligations [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | 3,407 |  |  |  |
Other Investment Funds [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 5,352 |  |  |  |
Furniture and Equipment [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |  |  |
Furniture and Equipment [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |  |  |
Leasehold Improvements [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |  |  |
Leasehold Improvements [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years |  |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 8,416 |
Operating Lease, Liability, Total |  |  |  | 8,860 |
Other Receivables |  |  |  | 18 |
Other Liabilities, Total |  |  |  | (406) |
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  | $ (20) |
Operating LLC [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  | 67.60%
COHN, LLC [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 72.96% | 71.25% | 32.22% |  | 32.40%
Noncontrolling Interest, Voting Interest, Ownership Percentage by Parent | 51.00% | 51.00% |  |  |
Noncontrolling Interest, Economic Interest, Ownership Percentage by Parent | 27.04% | 28.75% |  |  |

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