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Note 11 - Subsequent Events (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 20 Months Ended 24 Months Ended
Aug. 08, 2025
Jul. 30, 2025
Jul. 23, 2025
Jul. 18, 2025
Jul. 14, 2025
Jul. 11, 2025
Jul. 03, 2025
Jun. 17, 2025
Jun. 09, 2025
Jun. 06, 2025
May 05, 2025
Apr. 02, 2025
Mar. 17, 2025
Feb. 07, 2025
May 31, 2024
Apr. 12, 2024
Mar. 06, 2024
Jun. 26, 2022
Jul. 31, 2025
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jul. 19, 2025
Jun. 16, 2025
May 04, 2025
Mar. 16, 2025
Dec. 31, 2024
Mar. 05, 2024
Dec. 31, 2023
Conversion of Convertible Note Into Common Stock [Member]                                                                
Debt Conversion, Converted Instrument, Shares Issued (in shares)                                       780,112 0 1,480,112 1,597                  
Conversions of Series F Preferred Stock Into Common Stock [Member]                                                                
Conversion of Stock, Shares Issued (in shares)                                       6,081,754 58,333 8,272,662 117,374                  
Conversion of Stock, Shares Converted (in shares)                                       5,350 1,750 7,760 4,880                  
Series F Warrants [Member]                                                                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                     $ 0.83   $ 1.2       $ 30     $ 0.9529 [1]   $ 0.9529 [1]   $ 0.9529 [1]       $ 1.1   $ 4.96    
Stock Issued During Period, Shares, Warrant Exercises (in shares)                                             16,590                  
Proceeds from Warrant Exercises                                           $ 0 $ 497,701                  
Class of Warrant or Right, Exercised (in shares)                                             16,590                  
Class of Warrant or Right, Outstanding (in shares)                                       11,597,104   11,597,104   11,597,104           317,664    
Series F Warrants [Member] | Minimum [Member]                                                                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                                                         $ 2.22   $ 60.29  
Series F Warrants [Member] | Maximum [Member]                                                                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                                                         5.25   124.5  
Series B Warrants [Member]                                                                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                     $ 0.83                                 1.94        
Stock Issued During Period, Shares, Warrant Exercises (in shares)                                       1,952,839   2,220,688                    
Proceeds from Warrant Exercises                                       $ 1,619,683   $ 1,790,516 $ 0                  
Stock Issued During Period, Shares, Warrant Exchange (in shares)                       88,908                                        
Common Stock Purchase Warrants [Member]                                                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                 838,364 418,831 602,846   415,420 450,390                         797,067          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                 $ 1.1928 $ 1.1938 $ 0.8294   $ 0.8294 $ 0.8294                         $ 1.2546          
Subsequent Event [Member]                                                                
Stock Issued During Period, Shares, New Issues (in shares)   7,700,000                                                            
Subsequent Event [Member] | Conversions of Series F Preferred Stock Into Common Stock [Member]                                                                
Conversion of Stock, Shares Issued (in shares)                                     2,680,704                          
Conversion of Stock, Shares Converted (in shares)                                     3,279                          
Preferred Stock, Stated Value Per Share (in dollars per share)                                     $ 1,000                          
Subsequent Event [Member] | Conversions of Series F Preferred Stock Into Common Stock [Member] | Minimum [Member]                                                                
Preferred Stock, Convertible, Conversion Price (in dollars per share)                                     0.82                          
Subsequent Event [Member] | Conversions of Series F Preferred Stock Into Common Stock [Member] | Maximum [Member]                                                                
Preferred Stock, Convertible, Conversion Price (in dollars per share)                                     $ 1.4                          
Subsequent Event [Member] | Series F Warrants [Member]                                                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                                                   2,649,032            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.8294                                                              
Proceeds from Warrant Exercises $ 1,218,103                                                              
Class of Warrant or Right, Exercised (in shares) 1,468,656                                                              
Stock Issued During Period, Shares, Warrant Exchange (in shares) 1,468,656                                                              
Subsequent Event [Member] | Series B Warrants [Member]                                                                
Proceeds from Warrant Exercises                                     $ 6,526,485                          
Class of Warrant or Right, Exercised (in shares)                                     7,868,924                          
Class of Warrant or Right, Outstanding (in shares)                                     12,960                          
Subsequent Event [Member] | Common Stock Purchase Warrants [Member]                                                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     456,621 357,143                                           714,286            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 2.19 $ 1.4                                                        
Subsequent Event [Member] | Common Stock Purchase Warrants 1 [Member]                                                                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                                                   $ 1.4            
Series F Convertible Preferred Stock [Member]                                                                
Stock Issued During Period, Shares, New Issues (in shares)                                           4,500 3,100 12,700 17,950              
Preferred Stock, Convertible, Shares Issuable (in shares)                                       2,485,654 143,167 2,485,654 143,167 2,485,654 143,167              
Preferred Stock, Convertible, Conversion Price (in dollars per share)                     $ 0.83   $ 1.2       $ 30     $ 0 $ 0 $ 0 $ 0 $ 0 $ 0     $ 1.1   $ 0   $ 0
Preferred Stock, Stated Value Per Share (in dollars per share)                                   $ 1,000   $ 1,000   $ 1,000   $ 1,000                
Series F Convertible Preferred Stock [Member] | Minimum [Member]                                                                
Preferred Stock, Convertible, Conversion Price (in dollars per share)                                                         2.22   60.29  
Series F Convertible Preferred Stock [Member] | Maximum [Member]                                                                
Preferred Stock, Convertible, Conversion Price (in dollars per share)                                                         $ 5.25   $ 124.5  
Alpha [Member] | Series F Warrants [Member]                                                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               797,067 838,364 418,831 602,846   415,420 450,390 14,189 28,378 16,588                              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)               $ 1.2546 $ 1.1928 $ 1.1938 $ 0.8294   $ 1.2036 $ 2.2203 $ 60.29 $ 60.29 $ 60.29                              
Alpha [Member] | Subsequent Event [Member]                                                                
Proceeds from Issuance or Sale of Equity     $ 1,000,000 $ 1,500,000   $ 800,000                                                    
Alpha [Member] | Subsequent Event [Member] | Conversion of Convertible Note Into Common Stock [Member]                                                                
Debt Conversion, Converted Instrument, Interest             $ 8,612                                                  
Debt Conversion, Converted Instrument, Shares Issued (in shares)             10,383                                                  
Debt Instrument, Convertible, Conversion Price (in dollars per share)             $ 0.8294                                                  
Alpha [Member] | Subsequent Event [Member] | Series F Warrants [Member]                                                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     456,621 1,071,429   671,818                                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 2.19 $ 1.4   $ 1.1908                                                    
Alpha [Member] | Subsequent Event [Member] | Series A Warrants [Member]                                                                
Stock Issued During Period, Shares, Warrant Exercises (in shares)         63,017                                                      
Alpha [Member] | Series F Convertible Preferred Stock [Member]                                                                
Stock Issued During Period, Shares, New Issues (in shares)               1,000 1,000 500 500   500 1,000 1,050 1,050 1,000 10,000                            
Preferred Stock, Convertible, Conversion Price (in dollars per share)               $ 1.2546 $ 1.1928 $ 1.1938 $ 0.8294   $ 1.2036 $ 2.2203 $ 32.15 $ 37 $ 60.29                              
Alpha [Member] | Series F Convertible Preferred Stock [Member] | Subsequent Event [Member]                                                                
Stock Issued During Period, Shares, New Issues (in shares)     1,000 1,500   800                                                    
Preferred Stock, Convertible, Shares Issuable (in shares)     456,621 1,071,429   671,818                                                    
Preferred Stock, Convertible, Conversion Price (in dollars per share)     $ 2.19 $ 1.4   $ 1.1908                                                    
[1] Reflects the exercise price after the March 2025 Down Round Trigger on March 17, 2025 as described above.