Note 4 - Intangible Assets (Details Textual) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2020	Sep. 30, 2025	Sep. 30, 2024
Finite-Lived Intangible Asset, Useful Life	25 years	25 years
Amortization of Intangible Assets		$ 101,172.0	$ 101,172.0
Licensing Agreements [Member]
Finite-Lived Intangible Asset, Useful Life	25 years	25 years
License Agreement, Renewal Period	5 years	5 years
Upfront License Payment	$ 2.5