Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income	$ 1,363	$ 2,124	$ 2,076	$ 1,551	$ 1,565	$ 803	$ 1,265	$ 1,690	$ 7,114	$ 5,324
Denominator:
Denominator for basic net income per share - weighted-average outstanding shares (in shares)									12,282	12,018
Effect of dilutive securities:
Stock options and restricted stock (in shares)									823	1,023
Denominator for diluted net income per share - weighted-average outstanding shares (in shares)									13,105	13,041
Net income per share - basic (in dollars per share)	$ 0.11	$ 0.17	$ 0.17	$ 0.13	$ 0.13	$ 0.07	$ 0.11	$ 0.14	$ 0.58	$ 0.44
Net income per share - diluted (in dollars per share)	$ 0.10	$ 0.16	$ 0.16	$ 0.12	$ 0.12	$ 0.06	$ 0.10	$ 0.13	$ 0.54	$ 0.41