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Note 9 - Common and Preferred Stock (Details Textual)					12 Months Ended		42 Months Ended
	Jul. 02, 2021 USD ($)	Jul. 01, 2021 USD ($) $ / shares shares	Jun. 29, 2021 $ / shares shares	Mar. 05, 2020 shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Jul. 02, 2026 $ / shares	Dec. 21, 2024 $ / shares
Common Stock, Shares Authorized (in shares)					100,000,000	85,000,000	100,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 0.01	$ 0.01	$ 0.01
Common Stock, Shares, Issued (in shares)					75,353,889	66,710,795	75,353,889
Proceeds from Issuance of Common Stock | $					$ 22,135,000	$ 38,490,000
Preferred Stock, Shares Issued, Total (in shares)					329	329	329
Preferred Stock, Dividend Rate, Percentage					8.875%	8.875%
Preferred Stock, Shares Authorized (in shares)					100,000	100,000	100,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 0.01	$ 0.01	$ 0.01
Payments of Dividends | $					$ 5,106,000	$ 5,106,000	$ 16,767,000
Preferred Class A [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)				405.05
Series 1 Preferred Stock [Member]
Conversion of Stock, Shares Converted (in shares)					9,671
Conversion of Stock, Shares Issued (in shares)					3,917,235
Preferred Stock, Shares Issued, Total (in shares)					329		329
Depository Shares [Member]
Preferred Stock, Shares Per Depository Share (in dollars per share) | $ / shares			$ 0.001
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares		$ 25
Preferred Stock, Liquidation Preference Per Share Per Year		2.21875
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares									$ 0.56
Depository Shares [Member] | Forecast [Member]
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares								$ 25
Depository Shares [Member] | Upon Change of Control [Member]
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares		$ 25
Depository Shares [Member] | Sale Including Overallotment Option [Member]
Stock Issued During Period, Shares, New Issues (in shares)			2,000,000
Sale Including Overallotment Option [Member] | Sale Including Overallotment Option [Member] | Maximum [Member]
Stock Issued During Period, Shares, New Issues (in shares)			300,000
Series A Preferred Stock [Member]
Preferred Stock, Shares Issued, Total (in shares)					2,300	2,300	2,300
Preferred Stock, Dividend Rate, Percentage	8.875%	8.875%	8.875%		8.875%	8.875%
Proceeds From Issuance of Preferred Stock, Net of Issuance Costs | $	$ 54,000,000
Preferred Stock, Shares Authorized (in shares)		7,500			7,500	7,500	7,500
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.01			$ 0.01	$ 0.01	$ 0.01
Preferred Stock, Liquidation Preference, Value | $		$ 25,000
Preferred Stock, Liquidation Preference Per Share Per Year		2,218.75
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares									$ 560
Conversion of Stock, Shares Cap (in shares)		3,748.13
Series A Preferred Stock [Member] | Forecast [Member]
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares								$ 25,000
Series A Preferred Stock [Member] | Upon Change of Control [Member]
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares		$ 25,000
Conversion of Convertible Senior Notes 2020 into Preferred Stock [Member]
Debt Conversion, Converted Instrument, Shares Issued (in shares)				10,000
Certain Institutional and Individual Investors [Member]
Stock Issued During Period, Shares, New Issues (in shares)					7,000,000	10,500,000
Proceeds from Issuance of Common Stock | $					$ 22,100,000	$ 38,500,000

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