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Note 21 - Equity (Details Textual) $ / shares in Units, $ in Thousands						12 Months Ended
	Mar. 10, 2020 $ / shares shares	Dec. 30, 2019 USD ($) $ / shares shares	Dec. 23, 2019 $ / shares shares	Nov. 07, 2019 USD ($) $ / shares shares	Oct. 21, 2019 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares	Jun. 07, 2021 USD ($)	Mar. 05, 2021 USD ($)	Dec. 01, 2020 USD ($)	Aug. 31, 2020 USD ($)	Sep. 01, 2017 $ / shares	Aug. 31, 2017 $ / shares
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.001					$ 0.001	$ 0.001
Preferred Stock, Shares Authorized (in shares)						50,000,000	50,000,000
Preferred Stock, Shares Issued, Total (in shares)						27,413,098	27,413,098
Preferred Stock, Shares Outstanding, Ending Balance (in shares)						27,413,098	27,413,098
Stock Issued During Period, Value, New Issues | $						$ 9,076
Dividends, Total | $						671	$ 27	$ 519
Dividends, Distributions to Non-controlling Interests | $						$ 1,970	$ 35	213
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares						$ 0.01	$ 0.01						$ 0.01	$ 0.001
Increase (Decrease) in Other Investments | $		$ 7,779					$ (9,694)
Noncontrolling Interest [Member]
Stock Issued During Period, Value, New Issues | $						$ 0
Dividends, Distributions to Non-controlling Interests | $						$ 1,970	$ 35	$ 213
Equity Agreement [Member] | Northland Capital Markets [Member]
Aggregative Value of Shares | $										$ 9,318
Equity Agreement [Member] | Northland Capital Markets [Member] | Maximum [Member]
Aggregate Offering Price | $											$ 75,000
Equity Distribution Letter Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)						300,859	0
Aggregate Offering Price | $									$ 7,966
Percentage of Gross Offering Proceeds of Shares Sold									2.50%
Stock Issued During Period, Value, New Issues | $						$ 9,076
The December 2020 Letter Agreement [Member]
Stock Repurchase Program, Authorized Amount | $							$ 1,000
The August 2020 Letter Agreement [Member]
Stock Repurchase Program, Authorized Amount | $												$ 2,000
The 10b5-1 Plan [Member]
Treasury Stock, Shares, Acquired (in shares)						49,544	121,181	7,890
Treasury Stock, Value, Acquired, Par Value Method | $						$ 857	$ 2,143	$ 65
Private Repurchase Transaction [Member]
Treasury Stock, Shares, Acquired (in shares)				1,000	23,000
Treasury Stock, Value, Acquired, Par Value Method | $				$ 5	$ 230
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares				$ 4.50	$ 10.00
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	$ 100.00
Repurchase of Warrants, Price per Share (in dollars per share) | $ / shares	200.00
Share Price (in dollars per share) | $ / shares	$ 20.00
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	10
Percentage of Purchase Price Required for Adjustments	1.00%
Number of Fractal Units Issued (in shares)	0
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares	$ 0.001
Daniel G. Cohen And DGC Trust [Member]
Voting Power, Percentage						61.80%
Daniel G. Cohen [Member]
Stock Issued During Period, Value, New Issues | $		4,351
Daniel G. Cohen [Member] | DGC Trust [Member]
Stock Issued During Period, Value, New Issues | $		3,428
Increase (Decrease) in Other Investments | $		$ 7,779
Daniel G. Cohen [Member] | Minimum [Member] | DGC Trust [Member]
Minimum Percentage of Common Stock Outstanding, Aggregated Shares Issued with Unit Redemption of LLC Units		19.99%
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
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	0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)						0	0
Series E Preferred Stock [Member]
Preferred Stock, Shares Issued, Total (in shares)						4,983,557
Preferred Stock, Shares Outstanding, Ending Balance (in shares)						4,983,557
Ratio of Shares To Vote						10
Voting Power, Percentage						11.20%
Series F Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 1
Preferred Stock, Shares Authorized (in shares)			25,000,000
Preferred Stock, Shares Issued, Total (in shares)		22,429,541				22,429,541
Preferred Stock, Shares Outstanding, Ending Balance (in shares)						22,429,541
Ratio of Shares To Vote			10
Voting Power, Percentage						50.60%
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] | SPA, Daniel G. Cohen And DGC Trust [Member]
Preferred Stock, Shares Issued, Total (in shares)		22,429,541
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
Minority Interest, Shares Issued (in shares)		370,881
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 1
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 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	$ 100.00
Class of Warrant or Right, Exercise Trigger, Percentage of Common Stock Owned by Individual or Affiliates	4.95%

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