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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

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

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