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Note 9 - Common and Preferred Stock (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended 64 Months Ended
Jul. 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
Jun. 30, 2025
USD ($)
$ / shares
shares
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Dec. 31, 2024
$ / shares
shares
Jun. 30, 2025
$ / shares
shares
Jul. 02, 2026
$ / shares
Jun. 19, 2025
$ / 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)               81,896,376       81,896,376   75,353,889 81,896,376    
Common Stock, Shares, Outstanding (in shares)               81,896,376       81,896,376   75,353,889 81,896,376    
Preferred Stock, Dividend Rate, Percentage               8.875% 8.875% 8.875% 8.875%            
Payments of Dividends | $                       $ 2,553,000 $ 2,553,000        
Adjustments to Additional Paid-In Capital, Reclassification of Dividends Paid | $               $ 0                  
Subsequent Event [Member]                                  
Dividends, Cash | $ $ 1,288,000                                
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 Outstanding (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    
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                        
Series A Preferred Stock [Member]                                  
Preferred Stock, Shares Issued, Total (in shares)               2,300       2,300   2,300 2,300    
Preferred Stock, Shares Outstanding (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 | $                       $ 19,320,000          
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                        
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