Note 9 - Net Loss Per Share Attributable to Common Stockholders - Anti-dilutive Stocks (Details) - shares	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	2,137,289	1,799,477	2,137,289	1,799,477
Warrant [Member]
Antidilutive securities (in shares)	662,106	861,533	662,106	861,533
Restricted Stock [Member]
Antidilutive securities (in shares)	454,203	0	454,203	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration