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Note 7 - Stockholders' Equity (Deficit) (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 20 Months Ended 24 Months Ended
Jun. 17, 2025
Jun. 09, 2025
Jun. 06, 2025
Jun. 05, 2025
May 31, 2025
May 05, 2025
Apr. 25, 2025
Apr. 02, 2025
Mar. 17, 2025
Feb. 07, 2025
May 31, 2024
Apr. 12, 2024
Mar. 06, 2024
Jun. 26, 2022
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 15, 2025
May 04, 2025
Mar. 16, 2025
Dec. 31, 2024
Mar. 05, 2024
Dec. 31, 2023
Jul. 01, 2023
Preferred Stock, Shares Authorized (in shares)                             25,000,000   25,000,000   25,000,000         25,000,000      
Common Stock, Shares Authorized, Increase (in shares)             6,500,000                                        
Payments of Stock Issuance Costs                                 $ 47,000 $ 272,976                  
Preferred Stock Dividends, Income Statement Impact                             $ 52,038 $ 49,748 119,688 110,983                  
Accrued Expenses Settled With Warrants                                 $ 350,000 $ 0                  
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)                             78,615 612 78,615 687                  
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount                             $ 0   $ 0   $ 0                
Restricted Stock Units (RSUs) [Member]                                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grant Date Fair Value                             219,105   219,105   219,105                
Share-Based Payment Arrangement, Expense                             111,832   161,710 $ 18,580                  
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount                             $ 93,000 $ 25,000 $ 93,000 $ 25,000 $ 93,000 $ 25,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested and Not Released in Period (in shares)                                 210                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                                   0                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)                                 142,730 901                  
Restricted Stock Units (RSUs) [Member] | Officer [Member]                                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)                                   0                  
Conversion of Convertible Note Into Common Stock [Member]                                                      
Debt Conversion, Converted Instrument, Shares Issued (in shares)                             780,112 0 1,480,112 1,597                  
Debt Conversion, Original Debt, Amount                             $ 646,994 $ 0 $ 1,416,994 $ 100,000                  
Debt Instrument, Convertible, Average Conversion Rate (in dollars per share)                             $ 0.8294 $ 0 $ 0.9573 $ 62.6235                  
Conversions of Series F Preferred Stock Into Common Stock [Member]                                                      
Conversion of Stock, Shares Converted (in shares)                             5,350 1,750 7,760 4,880                  
Conversion of Stock, Shares Issued (in shares)                             6,081,754 58,333 8,272,662 117,374                  
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                  
Class of Warrant or Right, Issued, Weighted Average Exercise Price (in dollars per share)       $ 1.2169   0.8294     $ 0.8294 $ 0.8294 [1]                                  
Proceeds from Warrant Exercises                                 $ 0 $ 497,701                  
Class of Warrant or Right, Exercised (in shares)                                   16,590                  
Class of Warrant or Right, Exchanged (in shares)                                 (125,362)                    
Class of Warrant or Right, Exchanged, Weighted Average Exercise Price (in dollars per share)                                 $ 1.1                    
Deemed Dividend on Warrants                                 $ 116,199 $ 7,751 [2]                  
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                    
Class of Warrant or Right, Issued, Weighted Average Exercise Price (in dollars per share)                             $ 0.8294   $ 0.9639                    
Proceeds from Warrant Exercises                             $ 1,619,683   $ 1,790,516 $ 0                  
Class of Warrant or Right, Value, Exercised                                 2,140,516                    
Accrued Expenses Settled With Warrants                                 350,000                    
Proceeds From Warrant Settlement                                 1,790,516                    
Stock Issued During Period, Shares, Warrant Exchange (in shares)               88,908                                      
Class of Warrant or Right, Exchanged (in shares)               125,362                                      
Class of Warrant or Right, Exchanged, Weighted Average Exercise Price (in dollars per share)               $ 1.1                                      
Stock Issued During Period, Shares, Value, Warrant Exchange               $ 108,468                                      
Deemed Dividend on Warrants                                 $ 2,426,968                    
Maximum [Member] | Series F Warrants [Member]                                                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (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                            
Warrants and Rights Outstanding, Term (Year) 3 years 3 years 3 years     3 years     3 years 3 years 3 years 3 years 3 years               3 years            
Alpha [Member] | Series F Warrants [Member] | Purchased June 2023 [Member]                                                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                     $ 30                               $ 380
Deemed Dividend on Warrants         $ 7,751                                            
Series F Convertible Preferred Stock [Member]                                                      
Preferred Stock, Dividend Rate, Percentage                           5.00%     5.00%                    
Preferred Stock, Shares Authorized (in shares)                           35,000 35,000   35,000   35,000         35,000      
Preferred Stock, Stated Value Per Share (in dollars per share)                           $ 1,000 $ 1,000   $ 1,000   $ 1,000                
Stock Issued During Period, Shares, New Issues (in shares)                                 4,500 3,100 12,700 17,950              
Proceeds from Issuance of Convertible Preferred Stock                                     $ 11,200,000 $ 17,950,000              
Preferred Stock, Convertible, Conversion Price (in dollars per share)           $ 0.83     $ 1.2       $ 30   $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ 1.1   $ 0   $ 0  
Proceeds from Issuance of Convertible Preferred Stock, Net                                     $ 11,125,000 $ 17,795,000              
Preferred Stock Dividends, Income Statement Impact                             $ 52,038 $ 49,748 $ 119,688 $ 110,983                  
Dividends Payable                             $ 814,317   $ 814,317   $ 814,317         $ 746,666      
Series F Convertible Preferred Stock [Member] | Maximum [Member]                                                      
Preferred Stock, Convertible, Conversion Price (in dollars per share)                                             $ 5.25   $ 124.5    
Series F Convertible Preferred Stock [Member] | Alpha [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                          
Proceeds from Issuance of Convertible Preferred Stock $ 1,000,000 $ 1,000,000       $ 500,000     $ 500,000 $ 1,000,000                                  
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 797,067 838,364 418,831     602,846     415,420 450,390 14,189 28,378 16,588                            
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                            
Proceeds from Issuance of Convertible Preferred Stock, Net                     $ 1,050,000 $ 1,050,000 $ 950,000                            
Payments of Stock Issuance Costs                         $ 50,000                            
Series F Convertible Preferred Stock [Member] | Alpha [Member] | Maximum [Member]                                                      
Equity Issuance, Maximum Additional Stated Value Issuable                           $ 25,000,000                          
[1] Reflects the exercise price after the March 2025 Down Round Trigger on March 17, 2025 as described above.
[2] On May 31, 2024, the Company agreed to reduce the exercise price of a warrant held by Alpha originally issued in June 2023 from $380.00 to $30.00. As result, the Company recorded a deemed dividend of $7,751 for the incremental value due to the modification.