Note 11 - Supplementary Balance Sheet Information - Schedule of Warranty and Retrofit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Balance	$ 10,223	$ 2,890	$ 2,330
Adjustments for acquisitions and divestitures	0	2,475	254
Accruals for warranties during the year	2,736	8,198	2,438
Costs incurred during the year	(2,830)	(3,340)	(2,132)
Balance	$ 10,129	$ 10,223	$ 2,890