Note 9 - Restructuring - Schedule of Restructuring Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Restructuring charges	$ 11,808	$ 4,577	$ 712
Employee Severance [Member]
Balance at beginning of period	1,011	462
Restructuring charges	5,297	4,577
Payments	(5,351)	(4,028)
Balance at end of period	$ 957	$ 1,011	$ 462