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Note 8 - Stockholders' Equity - Stock Warrants Outstanding and Issuances (Details) | 3 Months Ended
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Dec. 31, 2023 $ / shares shares
Stock Warrants Outstanding, Shares (in shares) | 1,702,888
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
Investor Stock Warrants 1 [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
Stock Warrants Outstanding, Expiration | Sep. 12, 2024
Investor Stock Warrants 2 [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 1 [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
Stock Warrants Outstanding, Expiration | Sep. 12, 2024
Placement Agent Stock Warrants 2 [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 3 [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 3 [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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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
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