Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 1,565	$ 803	$ 1,265	$ 1,690	$ 1,757	$ 1,614	$ 1,316	$ (2,851)	$ 5,324	$ 1,836
Denominator:
Denominator for basic net income per share - weighted-average outstanding shares (in shares)									12,018	11,881
Effect of dilutive securities:
Stock options and restricted stock (in shares)									1,023	992
Denominator for diluted net income per share - weighted-average outstanding shares (in shares)									13,041	12,873
Net income per share - basic (in dollars per share)	$ 0.13	$ 0.07	$ 0.11	$ 0.14	$ 0.15	$ 0.14	$ 0.11	$ (0.24)	$ 0.44	$ 0.15
Net income per share - diluted (in dollars per share)	$ 0.12	$ 0.06	$ 0.10	$ 0.13	$ 0.14	$ 0.13	$ 0.10	$ (0.24)	$ 0.41	$ 0.14