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Note 5 - Preferred Stock (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Oct. 06, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Jun. 30, 2024
Aug. 23, 2024
Mar. 30, 2023
Dec. 31, 2022
Preferred Stock, Shares Authorized (in shares)     42,000   42,000   42,000        
Preferred Stock, Shares Designated (in shares)     1,983,250   1,983,250            
Preferred Stock, Shares Issued (in shares)     545   545   1,930        
Stock Issued During Period, Shares, Warrants Exercised (in shares)           8,516          
Preferred Stock, Shares Outstanding (in shares)     545   545   1,930        
Class of Warrant or Right, Outstanding (in shares)     2,345,603   2,345,603            
Conversion of Series F Preferred Stock to Common Stock [Member]                      
Conversion of Stock, Shares Converted (in shares)       1,229 3,033 1,404          
Conversion of Stock, Amount of Dividends Converted       $ 43,000 $ 194,000 $ 47,000          
Conversion of Stock, Shares Issued (in shares)       49,143 288,968 52,812 352,624 641,592      
Preferred Warrants [Member]                      
Stock Issued During Period, Shares, Warrants Exercised (in shares)         1,648            
Class of Warrant or Right, Exercised (in shares)     1,648   1,648            
Proceeds from Warrant Exercises         $ 1,607,000            
Proceeds From Warrant Exercises, Net         $ 1,478,000 $ 0          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 975   $ 975            
Warrants and Rights Outstanding, Term (Year)     3 years   3 years            
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights     100.00%   100.00%            
Class of Warrant or Right, Exercise Price of Warrants or Rights Exercised (in dollars per share)         $ 975            
Class of Warrant or Right, Outstanding (in shares)     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            
Common Warrants [Member]                      
Stock Issued During Period, Shares, Warrants Exercised (in shares)     208,933                
Class of Warrant or Right, Exercised (in shares)     208,933   208,933 8,516 18,681        
Proceeds from Warrant Exercises     $ 713,000                
Proceeds From Warrant Exercises, Net     $ 671,000                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 3.44   $ 3.44   $ 69.03   $ 3.41438   $ 2,653.6
Warrants and Rights Outstanding, Term (Year)     5 years   5 years            
Class of Warrant or Right, Exercise Price of Warrants or Rights Exercised (in dollars per share)     $ 3.41438   $ 3.41   $ 31.18        
Class of Warrant or Right, Issued (in shares)         24,104   113,597        
Class of Warrant or Right, Outstanding (in shares)     2,345,603   2,345,603   103,453   2,401,047   8,609
Class of Warrant or Right, Cash Fee, Percentage of Proceeds     8.00%                
Class of Warrant or Right, Cash Fee     $ 57,000                
Series F Preferred Stock [Member]                      
Preferred Stock, Convertible, Conversion Price (in dollars per share)     $ 11.17 $ 68.4 $ 11.17 $ 68.4       $ 68.4  
Preferred Stock, Convertible, Conversion Price Percentage                   80.00%  
Preferred Stock, Convertible, Floor Price (in dollars per share) $ 11.168   $ 11.168   $ 11.168            
Preferred Stock, Stated Value Per Share (in dollars per share) $ 1,000                    
Preferred Stock, Dividend Rate, Percentage 9.00%       20.00%            
Stock Issued During Period, Shares, Warrants Exercised (in shares)     1,648                
Conversion of Stock, Shares Converted (in shares)         3,033   4,620        
Preferred Stock, Shares Outstanding (in shares)     545   545   1,930        
Dividends Payable     $ 16,000,000   $ 16,000,000   $ 136,000,000        
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