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Note 21 - Equity (Details Textual)								12 Months Ended
	Mar. 20, 2020 $ / shares	Mar. 10, 2020	Dec. 30, 2019 USD ($) $ / shares shares	Dec. 23, 2019 $ / shares shares	Nov. 07, 2019 USD ($) $ / shares shares	Oct. 21, 2019 USD ($) $ / shares shares	Aug. 29, 2018 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 01, 2020 USD ($) $ / shares	Aug. 18, 2020 $ / shares	Mar. 19, 2018 USD ($)	Dec. 31, 2017 shares	Sep. 01, 2017 $ / shares	Aug. 31, 2017 $ / shares	Jan. 19, 2017 $ / shares
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.001	$ 0.001
Preferred Stock, Shares Authorized (in shares)								60,000,000	60,000,000
Preferred Stock, Shares Issued, Total (in shares)								27,413,098	27,413,098
Ratio of Shares To Vote								10
Preferred Stock, Shares Outstanding, Ending Balance (in shares)								27,413,098	27,413,098
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.01	$ 0.01						$ 0.01	$ 0.001
Dividends, Total | $								$ 27,000	$ 519,000	$ 966,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | $								9,694,000	$ 213,000	$ 426,000
Increase (decrease) other investments | $			$ 7,779,000					$ (9,694,000)
Common Unit, Outstanding (in shares)								38,418,255	38,952,715	16,431,254				16,934,944
COHN, LLC [Member]
Share Price (in dollars per share) | $ / shares			$ 11.89
COHN, LLC [Member] | Cohen & Company [Member]
Common Unit, Outstanding (in shares)								28,028,631
COHN, LLC [Member] | Daniel G. Cohen [Member]
Common Unit, Outstanding (in shares)								18,076,275
COHN, LLC [Member] | DGC Family Fintech Trust [Member]
Common Unit, Outstanding (in shares)								9,880,268
DGC Trust [Member]
Common Unit, Outstanding (in shares)								9,880,268	9,880,268
Noncontrolling Interest [Member]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | $								$ 9,694,000
Noncontrolling Interest [Member] | IMXI [Member] | Tranche One [Member]
Share Price (in dollars per share) | $ / shares																	$ 15
Noncontrolling Interest [Member] | IMXI [Member] | Tranche Two [Member]
Share Price (in dollars per share) | $ / shares																	$ 17
Operating LLC [Member]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | $								$ 35,000	$ 213,000	$ 426,000
Equity Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)								0
Equity Agreement [Member] | Northland Capital Markets [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares											$ 0.01
Aggregative Value of Shares | $											$ 5,108
Percentage of Gross Offering Proceeds of Shares Sold											2.50%
Equity Agreement [Member] | Northland Capital Markets [Member] | Maximum [Member]
Aggregate Offering Price | $											$ 75,000,000
Plan 10b5-1 [Member]
Stock Repurchase Program, Authorized Amount | $													$ 2,000,000
The 10b5-1 Plan [Member]
Treasury Stock, Shares, Acquired (in shares)							17,555	121,181	7,890	57,526
Treasury Stock, Value, Acquired, Par Value Method | $							$ 176,000	$ 2,143,000	$ 65,000	$ 594,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares							$ 10
Private Repurchase Transaction [Member]
Treasury Stock, Shares, Acquired (in shares)						23,000	17,555
Treasury Stock, Value, Acquired, Par Value Method | $						$ 230,000	$ 176,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares						$ 10	$ 10
The 2020 Rights Agreement [Member]
Voting Power, Percentage								50.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares								$ 100
Repurchase of Warrants, Price per Share (in dollars per share) | $ / shares								200
Share Price (in dollars per share) | $ / shares								$ 20
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)								10
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares												$ 0.001
Chief Financial Officer [Member]
Treasury Stock, Shares, Acquired (in shares)					1,000
Treasury Stock, Value, Acquired, Par Value Method | $					$ 5,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares					$ 4.50
Chief Financial Officer [Member] | Private Repurchase Transaction [Member]
Treasury Stock, Shares, Acquired (in shares)					1,000
Treasury Stock, Value, Acquired, Par Value Method | $					$ 5,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares					$ 4.50
SPA, Daniel G. Cohen And DGC Trust [Member]
Class of Warrant or Right, Exercise Trigger, Percentage of Common Stock Owned by Individual or Affiliates								19.99%
Daniel G. Cohen [Member]
Stock Issued During Period, Value, New Issues | $			$ 4,351,000
Daniel G. Cohen [Member] | DGC Trust [Member]
Stock Issued During Period, Value, New Issues | $			$ 3,428,000
COHN, LLC [Member] | Noncontrolling Interest [Member] | IMXI [Member] | Tranche One [Member]
Shares Subject To Certain Restrictions On Transfer (in shares)			264,021
COHN, LLC [Member] | Noncontrolling Interest [Member] | IMXI [Member] | Tranche Two [Member]
Shares Subject To Certain Restrictions On Transfer (in shares)			264,023
Series C Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.001	$ 0.001
Preferred Stock, Shares Authorized (in shares)								10,000	10,000
Preferred Stock, Voting Rights per Share								10,000
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares								$ 100,000
Preferred Stock, Shares Issued, Total (in shares)								0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)									0
Series E Preferred Stock [Member]
Preferred Stock, Shares Issued, Total (in shares)								4,983,557
Ratio of Shares To Vote								10
Preferred Stock, Shares Outstanding, Ending Balance (in shares)								4,983,557
Voting Power, Percentage								27.32%
Series F Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.001
Preferred Stock, Shares Authorized (in shares)				25,000,000
Preferred Stock, Shares Issued, Total (in shares)			22,429,541
Ratio of Shares To Vote				10
Series F Preferred Stock [Member] | Mr. Cohen [Member]
Stock Issued During Period, Shares, New Issues (in shares)				12,549,273
Series F Preferred Stock [Member] | DGC Trust [Member]
Preferred Stock, Shares Issued, Total (in shares)			9,880,268
Stock Issued During Period, Shares, New Issues (in shares)				9,880,268
Series F Preferred Stock [Member] | Daniel G. Cohen And DGC Trust [Member]
Preferred Stock, Shares Issued, Total (in shares)								22,429,541
Voting Power, Percentage								62.85%
Series F Preferred Stock [Member] | SPA, Daniel G. Cohen And DGC Trust [Member] | Noncontrolling Interest [Member]
Minority Interest, Shares Issued (in shares)			22,429,541
Series F Preferred Stock [Member] | Daniel G. Cohen [Member] | COHN, LLC [Member]
Preferred Stock, Shares Issued, Total (in shares)			12,549,273						12,549,273
Stock Issued During Period, Shares, New Issues (in shares)			370,881
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.00001
Minority Interest, Shares Issued (in shares)			370,881
Series F Preferred Stock [Member] | IMXI and COHN, LLC [Member] | COHN, LLC [Member]
Minority Interest, Shares Issued (in shares)			662,361
Series F Preferred Stock [Member] | IMXI and COHN, LLC [Member] | DGC Trust [Member]
Minority Interest, Shares Issued (in shares)			291,480
Series E And F Preferred Stock [Member]
Voting Power, Percentage								67.41%
Series C Junior Participating Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 100
Class of Warrant or Right, Exercise Trigger, Percentage of Common Stock Owned by Individual or Affiliates	4.95%	4.95%

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