Note 11 - Stock-based Compensation (Tables)

6 Months Ended

Mar. 31, 2025

Notes Tables

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

	Three Months Ended March 31,				Six Months Ended March 31,
	2025		2024		2025		2024
Restricted stock units	$	7,820	$	5,092	$	12,435	$	7,741
Employee stock purchase plan		211		318		469		670
Total stock-based compensation expense	$	8,031	$	5,410	$	12,904	$	8,411

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

				Weighted
				Average
				Grant-Date
	Shares			Fair Value
Outstanding as of September 30, 2024		764,111		$	59.65
Granted		558,839		$	47.50
Vested		(171,507	)	$	60.03
Forfeited		(92,961	)	$	81.65
Outstanding as of March 31, 2025		1,058,482		$	51.05

	Six Months Ended March 31,
	2025		2024
Time-based restricted stock units		403,150		220,174
Performance-based restricted stock units		155,689		388,532
Total units		558,839		608,706