v3.25.2
Note 6 - Preferred Stock (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended 24 Months Ended 30 Months Ended
Oct. 06, 2023
Mar. 31, 2023
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Jun. 30, 2025
Jun. 05, 2025
Mar. 30, 2023
Preferred Stock, Shares Authorized (in shares)     5,000,000     5,000,000   5,000,000   5,000,000 5,000,000    
Preferred Stock, Shares Designated (in shares)     1,983,250     1,983,250         1,983,250    
Preferred Stock, Shares Issued (in shares)     355     355   545   545 355    
Preferred Stock, Shares Outstanding (in shares)     355     355   545   545 355    
Stock Issued During Period, Shares, Warrants Exercised (in shares)     394,864     404,864              
Preferred Warrants [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 975                  
Warrants and Rights Outstanding, Term (Year)       3 years                  
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights       100.00%                  
Class of Warrant or Right, Exercised (in shares)       0     1,648            
Proceeds from Warrant Exercises             $ 1,607,000            
Proceeds From Warrant Exercises, Net           $ 0 $ 1,478,000            
Class of Warrant or Right, Outstanding (in shares)     31,102     31,102         31,102    
Class of Warrant or Right, Cash Fee, Percentage of Proceeds           8.00%              
Class of Warrant or Right, Cash Fee           $ 129,000              
Conversion of Series F Preferred Stock to Common Stock [Member]                          
Conversion of Stock, Shares Converted (in shares)     190   2,111 190 3,033            
Conversion of Stock, Amount of Dividends Converted     $ 19,000   $ 110,000 $ 19,000 $ 194,000            
Conversion of Stock, Shares Issued (in shares)     45,163   198,894 45,163 288,947 288,947 352,624 641,571 686,734    
Series F Preferred Stock [Member]                          
Preferred Stock, Convertible, Conversion Price (in dollars per share)     $ 3.77     $ 3.77   $ 11.17 $ 13.6 $ 11.17 $ 3.77 $ 3.77 $ 68.4
Preferred Stock, Convertible, Conversion Price Percentage                         80.00%
Preferred Stock, Convertible, Floor Price (in dollars per share) $ 11.17                        
Preferred Stock, Stated Value Per Share (in dollars per share) $ 1,000                        
Preferred Stock, Dividend Rate, Percentage 9.00%     20.00%                  
Conversion of Stock, Shares Converted (in shares)           190   3,033          
Preferred Stock, Shares Outstanding (in shares)     355     355   545 1,930 545 355    
Dividends Payable     $ 35,000     $ 35,000   $ 29,000,000 $ 136,000,000 $ 29,000,000 $ 35,000    
Stock Issued During Period, Shares, Warrants Exercised (in shares)             1,648            
Private Placement [Member]                          
Proceeds from Issuance or Sale of Equity   $ 6,386,000                      
Proceeds from Issuance or Sale of Equity, Net   5,364,000                      
Payments of Stock Issuance Costs   $ 1,022,000                      
Maximum [Member]                          
Preferred Stock, Shares Authorized (in shares)     5,000,000     5,000,000         5,000,000