Note 21 - Equity (Details Textual) $ / shares in Units, $ in Thousands					12 Months Ended
	Apr. 05, 2022 $ / shares	Mar. 10, 2020 $ / shares shares	Dec. 30, 2019 USD ($) shares	Dec. 23, 2019 $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Jun. 07, 2021 USD ($)	Mar. 05, 2021 USD ($)	Dec. 01, 2020 USD ($)	Aug. 31, 2020 USD ($)
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 | $					$ 2,558	671	$ 27
Dividends, Distributions to Non-controlling Interests | $					6,485	2,103	35
Increase (Decrease) in Other Investments | $							(9,694)
Noncontrolling Interest [Member]
Dividends, Distributions to Non-controlling Interests | $					$ 6,485	$ 2,103	35
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)					0	300,859
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
Treasury Stock, Value, Acquired, Par Value Method | $						$ 857	$ 2,143
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					60.70%
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%
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
Ratio of Shares To Vote					10
Preferred Stock, Shares Outstanding, Ending Balance (in shares)					4,983,557
Voting Power, Percentage					11.00%
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
Ratio of Shares To Vote				10
Preferred Stock, Shares Outstanding, Ending Balance (in shares)					22,429,541
Voting Power, Percentage					49.70%
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 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%
Common Stock [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares	$ 0.75				$ 1.75	$ 0.50	$ 0