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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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