Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ 1,766	$ 1,648	$ 3,978	$ 7,672
Denominator:
Denominator for basic net income per common share — weighted average shares outstanding	28,972,000	28,072,000	28,772,000	27,816,000
Effect of dilutive securities:
Stock options and restricted stock units	215,000	517,000	705,000	598,000
Denominator for diluted net income per common share — adjusted weighted average shares	29,187,000	28,589,000	29,477,000	28,414,000
Basic net income per common share:
Net income, basic (USD per share)	$ 0.06	$ 0.06	$ 0.14	$ 0.28
Diluted net income per common share
Net income, diluted (USD per share)	$ 0.06	$ 0.06	$ 0.13	$ 0.27
Potentially dilutive securities excluded from computation of earnings per share	2,241,860	617,841	1,146,581	667,841