Note 8 - Shareholders' Equity - Fair Value Assumptions of Stock Options (Details) - Share-Based Payment Arrangement, Option [Member] - $ / shares	3 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Risk free interest rate	0.00%
Volatility	0.00%
Minimum [Member]
Exercise price (in dollars per share)		$ 10.355
Risk free interest rate		3.93%
Volatility		106.48%
Expected term (in years) (Year)		2 years 6 months
Maximum [Member]
Exercise price (in dollars per share)		$ 12.606
Risk free interest rate		4.71%
Volatility		106.51%
Expected term (in years) (Year)		4 years

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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