Note 11 - Property, Plant and Equipment (Details Textual) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2025 USD ($) a	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Depreciation		$ 3.8	$ 3.5
Property Utilized for Parking [Member]
Area of Land (Acre) | a	17.3
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	$ 4.6