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Note 9 - Common and Preferred Stock (Details Textual)								3 Months Ended						6 Months Ended	9 Months Ended		12 Months Ended	67 Months Ended
	Oct. 15, 2025 USD ($)	Mar. 07, 2025 USD ($) $ / shares shares	Nov. 05, 2024 USD ($) $ / shares shares	Jul. 02, 2021 USD ($)	Jul. 01, 2021 USD ($) $ / shares shares	Jun. 29, 2021 $ / shares shares	Mar. 05, 2020 shares	Sep. 30, 2025 $ / shares shares	Jun. 30, 2025 USD ($)	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 $ / shares shares	Sep. 30, 2025 $ / shares shares	Jul. 02, 2026 $ / shares
Common Stock, Shares Authorized (in shares)								100,000,000							100,000,000		100,000,000	100,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.01							$ 0.01		$ 0.01	$ 0.01
Common Stock, Shares, Issued (in shares)								82,025,586							82,025,586		75,353,889	82,025,586
Preferred Stock, Dividend Rate, Percentage								8.875%	8.875%	8.875%	8.875%	8.875%	8.875%
Payments of Dividends | $															$ 3,841,000	$ 3,841,000
Adjustments to Additional Paid-In Capital, Reclassification of Dividends Paid | $									$ 0
Common Stock, Shares, Outstanding (in shares)								82,025,586							82,025,586		75,353,889	82,025,586
Subsequent Event [Member]
Dividends, Cash | $	$ 1,265,000
Series 1 Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)							405.05
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		329	329
Preferred Stock, Shares Authorized (in shares)								100,000							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	$ 0.01
Preferred Stock, Shares Outstanding (in shares)								329							329		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							2.21875			2.21875
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares								$ 0.55							$ 0.55			$ 0.55
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
Series A Preferred Stock [Member]
Preferred Stock, Shares Issued, Total (in shares)								2,300							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	7,500
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 0.01			$ 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
Payments of Dividends | $															$ 20,608,000
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares								$ 550							$ 550			$ 550
Conversion of Stock, Shares Cap (in shares)					3,748.13
Preferred Stock, Shares Outstanding (in shares)								2,300							2,300		2,300	2,300
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
Series A Preferred Stock [Member] | Reclassified From Accumulated Deficit To Additional Paid-in Capital [Member]
Adjustments to Additional Paid-In Capital, Reclassification of Dividends Paid | $														$ 19,320,000
Conversion of Convertible Senior Notes 2020 into Preferred Stock [Member]
Debt Conversion, Converted Instrument, Shares Issued (in shares)							10,000
Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		5,715,000	7,000,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 3.5	$ 3.34
Proceeds from Issuance of Common Stock, Gross | $		$ 20,000,000	$ 23,400,000
Proceeds from Issuance of Common Stock, Net | $		$ 18,300,000	$ 22,100,000
Sale Including Overallotment Option [Member] | Depository Shares [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

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