Note 4 - Stock-based Compensation (Tables)

9 Months Ended

Jun. 30, 2021

Notes Tables

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

	Nine months ended June 30, 2021
Dividend yield		0	%
Expected volatility		46.9	%
Risk-free interest rate		0.24	%
Expected life (years)		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, 2020		337,100		$	12.48
Granted		105,089			23.74
Exercised		(101,800	)		12.47
Forfeited or Expired		(38,709	)		13.68
Outstanding as of June 30, 2021		301,680		$	16.25

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, 2020		109,070		$	12.97
Granted		39,807			24.20
Vested		(12,230	)		11.08
Forfeited		(3,298	)		16.07
Unvested as of June 30, 2021		133,349		$	16.41