Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 1,757	$ 1,614	$ 1,316	$ (2,851)	$ 1,040	$ 945	$ 979	$ 324	$ 1,836	$ 3,288
Denominator:
Denominator for basic net income per share - weighted-average outstanding shares (in shares)									11,881	11,345
Effect of dilutive securities:
Stock options and restricted stock (in shares)									992	1,007
Denominator for diluted net income per share - weighted-average outstanding shares (in shares)									12,873	12,352
Net income per share - basic (in dollars per share)	$ 0.15	$ 0.14	$ 0.11	$ (0.24)	$ 0.09	$ 0.08	$ 0.09	$ 0.03	$ 0.15	$ 0.29
Net income per share - diluted (in dollars per share)	$ 0.14	$ 0.13	$ 0.10	$ (0.24)	$ 0.08	$ 0.08	$ 0.08	$ 0.03	$ 0.14	$ 0.27