Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income	$ 2,880	$ 2,124	$ 7,261	$ 5,752
Denominator:
Denominator for basic net income (loss) per share - weighted-average outstanding shares (in shares)	12,545	12,354	12,529	12,246
Effect of dilutive securities:
Stock options and restricted stock (in shares)	1,110	874	1,165	804
Denominator for diluted net income (loss) per share - weighted-average outstanding shares (in shares)	13,655	13,228	13,694	13,050
Net income per share - basic (in dollars per share)	$ 0.23	$ 0.17	$ 0.58	$ 0.47
Net income per share - diluted (in dollars per share)	$ 0.21	$ 0.16	$ 0.54	$ 0.44