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Note 12 - Stockholders' Equity (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 28, 2025
Jan. 15, 2025
Jun. 18, 2021
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-Based Payment Arrangement, Expense         $ 31,660     $ 66,053   $ 105,985 $ 171,617
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture         $ 0 $ 11,002 $ 9,002   $ 9,003    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)                   0 0
Proceeds from Warrant Exercises                   $ 3,813,057 $ 2,000,000
Conversion of Partitioned Notes to Common Stock [Member]                      
Debt Conversion, Original Debt, Amount                   $ 600,000  
Conversion of Stock, Shares Issued (in shares)                   753,084  
Outstanding Warrants [Member]                      
Class of Warrant or Right, Exercised During Period (in shares)     2,061,112                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 1.85                
Proceeds from Warrant Exercises     $ 3,800,000                
Series A Warrants [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     1,545,834                
Series B Warrants [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     1,545,834                
New Warrants [Member]                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 2.15                
Warrants and Rights Outstanding, Term (Year)     5 years                
Beneficial Ownership Limitation, Percentage of Common Stock Outstanding     $ 4.99                
Pre-Funded Warrants [Member]                      
Proceeds from Warrant Exercises                     $ 1,600
Total Warrants Exercised (in shares)                     777,666
Director [Member]                      
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)                   22,136 4,287
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture                   $ 20,002 $ 9,003
Restricted Stock [Member]                      
Share-Based Payment Arrangement, Expense                   $ 125,989 $ 17,167
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)                   280,500 168,963
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                   3 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value                   $ 213,645 $ 31,200
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)                   25,748 1,351
Employee Stock Purchase Plan [Member]                      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)       43,334              
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent       85.00%              
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 1,251 1,390                  
Share-Based Payment Arrangement, Expense $ 876 $ 456