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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 |  |  |  |  |  |  |  |  |

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