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Note 12 - Stockholders' Equity - Stock Warrants Outstanding and Issuances (Details)
 12 Months Ended
Sep. 30, 2024
$ / shares
shares
Stock Warrants Outstanding, Shares (in shares) 804,533
Financing Warrants [Member]  
Stock Warrants Outstanding, Issue Date Oct. 10, 2017
Stock Warrants Outstanding, Shares (in shares) 1,327
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 132.5
Stock Warrants Outstanding, Expiration Oct. 10, 2025
Placement Agent Stock Warrants 1 [Member]  
Stock Warrants Outstanding, Issue Date Feb. 04, 2021
Stock Warrants Outstanding, Shares (in shares) 31,564
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 3.88
Stock Warrants Outstanding, Expiration Feb. 04, 2026
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 2 [Member]  
Stock Warrants Outstanding, Issue Date May 14, 2021
Stock Warrants Outstanding, Shares (in shares) 179,536
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 2.85
Stock Warrants Outstanding, Expiration May 12, 2026