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Note 9 - Common and Preferred Stock (Details Textual)
3 Months Ended 12 Months Ended 45 Months Ended 61 Months Ended
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
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
Dec. 31, 2024
$ / shares
shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 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)             81,785,011   75,353,889 81,785,011 81,785,011  
Preferred Stock, Dividend Rate, Percentage             8.875% 8.875%        
Payments of Dividends | $             $ 1,288,000 $ 1,288,000        
Common Stock, Shares, Outstanding (in shares)             81,785,011   75,353,889 81,785,011 81,785,011  
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                
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 | $                   $ 18,055,000    
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                
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