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Note 5 - Preferred Stock - Schedule of Stock by Class (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Jun. 30, 2024
Oct. 06, 2023
Mar. 30, 2023
Accrued Dividends amount     $ 64,000 $ 149,000        
Convertible, Conversion Price (in dollars per share)             $ 0.2792  
Preferred stock, shares outstanding (in shares)   545 545   1,930 545    
Conversion of Series F Preferred Stock to Common Stock [Member]                
Accrued Dividends amount   $ 110,000 $ 194,000          
Conversions, preferred (in shares)   (2,111) (3,033)          
Conversions, Shares Issued (in shares)   7,955,743 11,558,000   14,102,000 25,660,000    
Series F Preferred Stock [Member]                
Issuance, preferred (in shares) 6,550   1,648          
Accrued Dividends amount     $ 63,000,000   $ 345,000,000      
Conversions, preferred (in shares)     (3,033)   (4,620)      
Conversions dividend     $ (195,000,000)   $ (209,000,000)      
Convertible, Conversion Price (in dollars per share)   $ 0.33 $ 0.33 $ 1.71   $ 0.33   $ 1.71
Preferred stock, shares outstanding (in shares)   545 545   1,930 545    
Balance dividend   $ 4,000,000 $ 4,000,000   $ 136,000,000 $ 4,000,000    
Series F Preferred Stock [Member] | Weighted Average [Member]                
Convertible, Conversion Price (in dollars per share)   $ 0.28 $ 0.28   $ 0.34 $ 0.28