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Note 8 - Stockholders' Equity - Stock Warrants Outstanding and Issuances (Details)
3 Months Ended
Dec. 31, 2022
$ / shares
shares
Stock Warrants Outstanding, Shares (in shares) 1,757,629
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 $ 132.50
Stock Warrants Outstanding, Expiration Oct. 10, 2025
Investor Stock Warrants 1 [Member]  
Stock Warrants Outstanding, Issue Date Oct. 19, 2018
Stock Warrants Outstanding, Shares (in shares) 3,120
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 25.00
Stock Warrants Outstanding, Expiration Oct. 19, 2023
Placement Agent Stock Warrants 1 [Member]  
Stock Warrants Outstanding, Issue Date Dec. 16, 2018
Stock Warrants Outstanding, Shares (in shares) 10,000
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 31.25
Stock Warrants Outstanding, Expiration Oct. 16, 2023
Investor Stock Warrants 2 [Member]  
Stock Warrants Outstanding, Issue Date Mar. 12, 2019
Stock Warrants Outstanding, Shares (in shares) 41,621
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 4.00
Stock Warrants Outstanding, Expiration Oct. 19, 2023
Investor Stock Warrants 3 [Member]  
Stock Warrants Outstanding, Issue Date Mar. 12, 2019
Stock Warrants Outstanding, Shares (in shares) 872,625
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 4.00
Stock Warrants Outstanding, Expiration Sep. 12, 2024
Investor Stock Warrants 4 [Member]  
Stock Warrants Outstanding, Issue Date Mar. 12, 2019
Stock Warrants Outstanding, Shares (in shares) 13,738
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 0.05
Stock Warrants Outstanding, Expiration Sep. 12, 2024
Placement Agent Stock Warrants 2 [Member]  
Stock Warrants Outstanding, Issue Date Mar. 12, 2019
Stock Warrants Outstanding, Shares (in shares) 11,992
Stock Warrants Outstanding, Price (in dollars per share) | $ / shares $ 4.00
Stock Warrants Outstanding, Expiration Sep. 12, 2024
Placement Agent Stock Warrants 3 [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 5 [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 4 [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