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Note 21 - Equity (Details Textual) |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |
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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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