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Note 5 - Stockholders' Equity, Options, and Warrants (Details Textual)
1 Months Ended 9 Months Ended
Jul. 31, 2018
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Jul. 31, 2025
shares
Share Price (in dollars per share) | $ / shares   $ 0.06    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares   725,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares   $ 0.05    
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 0.25    
Series C Preferred Stock [Member]        
Preferred Stock, Shares Outstanding (in shares) | shares   4,063    
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 0.1    
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares   $ 1,000    
Dividends | $   $ 243,780 $ 243,030  
Common Stock Dividends, Shares (in shares) | shares   1,743,457 1,808,400  
Dividends, Preferred Stock, Cash | $   $ 90,660 $ 90,420  
Dividends Payable | $   153,120 152,610  
Share-Based Payment Arrangement, Option [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $   $ 58,492    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 9 months 7 days    
Share-Based Payment Arrangement, Expense | $   $ 95,364 $ 136,601  
Qualified Options [Member] | Share-Based Payment Arrangement, Employee [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares   725,000    
Share-based Compensation by Share-based Payment Arrangement, Grants in Period, Number of Employees   5    
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)   10 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value | $   $ 25,116    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum   3.95%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum   4.52%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate   0.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum   72.53%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum   85.29%    
Qualified Options [Member] | Share-Based Payment Arrangement, Employee [Member] | Minimum [Member]        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares   $ 0.04    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)   5 years    
Qualified Options [Member] | Share-Based Payment Arrangement, Employee [Member] | Maximum [Member]        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares   $ 0.11    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)   7 years    
Restricted Stock Units (RSUs) [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $   $ 21,788    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   6 months 16 days    
The 2015 Incentive Plan [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares   48,538,185   18,900,685
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) | shares 20,000,000      
Employee Stock Purchase Plan [Member]        
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | shares   521,102 290,625  
Proceeds from Stock Plans | $   $ 14,883 $ 8,627  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares   1,314,527