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Note 12 - Stockholders' Equity (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 28, 2024
Jun. 30, 2023
Jun. 18, 2021
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-Based Payment Arrangement, Expense       $ 66,053     $ 105,172     $ 171,617 $ 220,591
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture           $ 9,003 $ 11,002 $ 16,002 $ 12,002    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)                   0 0
Warrants and Rights Outstanding, Term (Year)       5 years           5 years  
Class of Warrant or Right, Issued During Period (in shares)                     0
Warrant Inducement Agreement [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       1,030,556           1,030,556  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 1.85           $ 1.85  
Proceeds from Issuance of Warrants                   $ 1,900,000  
Series A Warrants [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       1,030,556           1,030,556  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 1.85           $ 1.85  
Series B Warrants [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       1,030,556           1,030,556  
Pre-Funded Warrants [Member]                      
Total Warrants Exercised (in shares)                   911,672  
Common Stock [Member]                      
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)         1,390     1,557      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)       168,963     14,183   2,222    
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)       849 186 316 1,852 799 1,102    
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)           4,287 937 1,286 855    
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture         $ 48,315 $ 0 $ 0 $ 0 $ 0    
Common Stock [Member] | Director [Member]                      
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)                   4,287 3,078
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture                   $ 9,003 $ 39,006
Restricted Stock [Member]                      
Share-Based Payment Arrangement, Expense                   $ 171,617 $ 220,591
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)                   168,963 16,404
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                   3 years 3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value                   $ 244,996 $ 31,200
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares)                   1,351 2,650
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) 1,390 1,557                  
Share-Based Payment Arrangement, Expense $ 456 $ 3,563