Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income	$ 1,551	$ 1,690
Denominator:
Denominator for basic net income (loss) per share - weighted-average outstanding shares (shares)	12,088	11,963
Effect of dilutive securities:
Stock options and restricted stock (shares)	926	1,016
Denominator for diluted net income (loss) per share - weighted-average outstanding shares (shares)	13,014	12,979
Net income per share - basic (in dollars per share)	$ 0.13	$ 0.14
Net income per share - diluted (in dollars per share)	$ 0.12	$ 0.13