Note 8 - Stockholders' Equity - Stock Warrants Outstanding and Issuances (Details) |
9 Months Ended |
|---|---|
|
Jun. 30, 2026
$ / shares
shares
| |
| Stock Warrants Outstanding, Shares (in shares) | 662,106 |
| Investor Stock Warrants 1 [Member] | |
| Stock Warrants Outstanding, Issue Date | May 14, 2021 |
| Stock Warrants Outstanding, Shares (in shares) | 592,106 |
| Stock Warrants Outstanding, Price (in dollars per share) | $ / shares | $ 2.51 |
| Stock Warrants Outstanding, Expiration | Nov. 16, 2026 |
| Placement Agent Stock Warrants 1 [Member] | |
| Stock Warrants Outstanding, Issue Date | Mar. 26, 2025 |
| Stock Warrants Outstanding, Shares (in shares) | 70,000 |
| Stock Warrants Outstanding, Price (in dollars per share) | $ / shares | $ 1.88 |
| Stock Warrants Outstanding, Expiration | Mar. 24, 2030 |