Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 1,814	$ 1,551
Denominator:
Denominator for basic net income (loss) per share - weighted-average outstanding shares (in shares)	12,498	12,088
Effect of dilutive securities:
Stock options and restricted stock (shares)	947	926
Denominator for diluted net income (loss) per share - weighted-average outstanding shares (in shares)	13,445	13,014
Net income per share - basic (in dollars per share)	$ 0.15	$ 0.13
Net income per share - diluted (in dollars per share)	$ 0.13	$ 0.12