Note 8 - Supplementary Balance Sheet Information - Schedule of Warranty and Retrofit Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Balance at beginning of period	$ 10,223	$ 2,890
Adjustment for acquisitions	0	2,303
Accruals for warranties during the period	1,031	3,936
Costs incurred during the period	(1,903)	(2,871)
Balance at end of period	$ 9,351	$ 6,258