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Note 5 - Preferred Stock - Schedule of Stock by Class (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Mar. 31, 2023
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Jun. 30, 2024
Mar. 30, 2023
Accrued Dividends amount     $ 76 $ 282      
Preferred stock, shares outstanding (in shares)     545   1,930    
Conversion of Series F Preferred Stock to Common Stock [Member]              
Conversions, preferred (in shares)   (1,229) (3,033) (1,404)      
Conversions, Shares Issued (in shares)   49,143 288,968 52,812 352,624 641,592  
Series F Preferred Stock [Member]              
Issuance, preferred (in shares) 6,550   1,648        
Accrued Dividends amount     $ 76,000   $ 343,000    
Conversions, preferred (in shares)     (3,033)   (4,620)    
Conversions dividend     $ (196,000)   $ (207,000)    
Convertible, Conversion Price (in dollars per share)   $ 68.4 $ 11.17 $ 68.4     $ 68.4
Preferred stock, shares outstanding (in shares)     545   1,930    
Balance dividend     $ 16,000   $ 136,000    
Series F Preferred Stock [Member] | Weighted Average [Member]              
Convertible, Conversion Price (in dollars per share)     $ 11.2   $ 13.6