v3.26.1
Note 9 - 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, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Jun. 30, 2026
Mar. 30, 2023
Preferred Stock, Shares Authorized (in shares)     42,000     42,000   42,000   42,000 42,000  
Preferred Stock, Shares Issued (in shares)     150     150   150   150 150  
Preferred Stock, Shares Outstanding (in shares)     150     150   150   150 150  
Preferred Warrants [Member]                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 975              
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights     100.00%     100.00%         100.00%  
Class of Warrant or Right, Exercised (in shares)     0 0   0 0          
Class of Warrant or Right, Outstanding (in shares)     30,527     30,527         30,527  
Conversion of Series F Preferred Stock to Common Stock [Member]                        
Conversion of Stock, Shares Converted (in shares)     0 190   0 190          
Conversion of Stock, Amount of Dividends Converted       $ 19,000     $ 19,000          
Conversion of Stock, Shares Issued (in shares)       45,163     45,163 257,617 641,592 899,209 899,209  
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                    
Series F Preferred Stock [Member]                        
Preferred Stock, Shares Authorized (in shares)     42,000     42,000         42,000  
Preferred Stock, Shares Issued (in shares)     150     150         150  
Preferred Stock, Convertible, Conversion Price (in dollars per share)     $ 3.77     $ 3.77   $ 3.77 $ 11.17 $ 3.77 $ 3.77 $ 3.77
Preferred Stock, Convertible, Conversion Price Percentage                       80.00%
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)               970        
Preferred Stock, Shares Outstanding (in shares)     150     150   150 545 150 150  
Dividends Payable     $ 30,000     $ 30,000   $ 22,000 $ 29,000 $ 22,000 $ 30,000  
Maximum [Member]                        
Preferred Stock, Shares Authorized (in shares)     5,000,000     5,000,000         5,000,000