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Note 5 - Preferred Stock (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Oct. 06, 2023
Mar. 31, 2023
Mar. 31, 2023
Mar. 30, 2023
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Jun. 30, 2024
Dec. 31, 2022
Preferred Stock, Shares Authorized (in shares)         42,000 42,000   42,000 42,000  
Preferred Stock, Shares Designated (in shares)         1,983,250 1,983,250     1,983,250  
Preferred Stock, Shares Issued (in shares)         545 545   1,930 545  
Preferred Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.0001 $ 0.0001   $ 0.0001 $ 0.0001  
Preferred Stock, Convertible, Conversion Price (in dollars per share) $ 0.2792                  
Preferred Stock, Shares Outstanding (in shares)         545 545   1,930 545  
Class of Warrant or Right, Outstanding (in shares)         5,101,345 5,101,345     5,101,345  
Conversion of Series F Preferred Stock to Common Stock [Member]                    
Conversion of Stock, Shares Converted (in shares)         2,111 3,033        
Conversion of Stock, Shares Issued (in shares)         7,955,743 11,558,000   14,102,000 25,660,000  
Preferred Warrants [Member]                    
Class of Warrant or Right, Exercised (in shares)         1,648 1,648        
Proceeds from Warrant Exercises           $ 1,478,000 $ 0      
Class of Warrant or Right, Cash Fee, Percentage of Proceeds         8.00%          
Class of Warrant or Right, Cash Fee         $ 129,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 975 $ 975     $ 975  
Warrants and Rights Outstanding, Term (Year)         3 years 3 years     3 years  
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights         100.00% 100.00%     100.00%  
Class of Warrant or Right, Outstanding (in shares)         31,102 31,102     31,102  
Common Warrants [Member]                    
Class of Warrant or Right, Exercised (in shares)               746,027    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 1.71 $ 1.71   $ 1.73 $ 1.71 $ 0
Class of Warrant or Right, Issued (in shares)         963,745 963,745   4,543,626    
Class of Warrant or Right, Outstanding (in shares)         5,101,345 5,101,345   4,137,850 5,101,345 343,099
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              
Private Placement [Member] | Preferred Warrants [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       32,750            
Private Placement [Member] | Investor Warrants [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       3,830,417            
Series F Preferred Stock [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)   6,550       1,648        
Preferred Stock, Convertible, Conversion Price (in dollars per share)       $ 1.71 $ 0.33 $ 0.33 $ 1.71   $ 0.33  
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)           3,033   4,620    
Preferred Stock, Shares Outstanding (in shares)         545 545   1,930 545  
Dividends Payable         $ 4,000,000 $ 4,000,000   $ 136,000,000 $ 4,000,000  
Stock Issued During Period, Shares, Warrants Exercised (in shares)         1,648 1,648        
Proceeds from Warrant Exercises         $ 1,607,000 $ 1,607,000        
Proceeds From Warrant Exercises, Net         $ 1,478,000 $ 1,478,000        
Series F Preferred Stock [Member] | Private Placement [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)       6,550            
Preferred Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.0001            
Maximum [Member]                    
Preferred Stock, Shares Authorized (in shares)         5,000,000 5,000,000     5,000,000