Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Realized Gain (Loss), Foreign Currency Transaction, before Tax	$ (0.8)	$ 0.1	$ (1.7)	$ (2.7)