Net Income Per Share (Tables)

3 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Basic and Diluted Net Income Per Share

The following table presents shares used in the calculation of basic and diluted net income per share:

	Three Months Ended
	December 31,
	2019		2020
Weighted average common shares outstanding used in    calculating basic income per share		21,453,914		22,025,898
Effect of dilutive options and non-vested restricted stock    awards		436,151		719,227
Weighted average common and common equivalent shares    used in calculating diluted income per share		21,890,065		22,745,125