Note 7 - Stock-based Compensation (Tables)

3 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three months ended December 31, 2023
Dividend yield		0.00	%
Expected volatility		61.71	%
Risk-free interest rate		4.55	%
Expected life (years)	3.5
Vesting period (years)	3

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Number of options			Weighted average exercise price
Outstanding as of September 30, 2023		254,124		$	37.04
Granted		111,299			26.18
Exercised		-			-
Forfeited or expired		(1,731	)		41.64
Outstanding as of December 31, 2023		363,692		$	33.69

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

	Number of shares			Weighted average grant date fair value
Unvested shares as of September 30, 2023		90,575		$	49.92
Granted		121,884			26.18
Vested		(30,422	)		52.67
Forfeited		(2,017	)		35.26
Unvested as of December 31, 2023		180,020		$	32.32