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Note 8 - Stockholders' Equity - Stock Warrants Outstanding and Issuances (Details) | 3 Months Ended
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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

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