Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income	$ 3,157	$ 1,766	$ 5,778	$ 3,978
Denominator:
Denominator for basic net income per common share — weighted average shares outstanding	34,057,000	28,972,000	31,443,000	28,772,000
Effect of dilutive securities:
Stock options and restricted stock units	1,091,000	215,000	1,263,000	705,000
Denominator for diluted net income per common share — adjusted weighted average shares	35,148,000	29,187,000	32,706,000	29,477,000
Basic net income per common share:
Net income, basic (USD per share)	$ 0.09	$ 0.06	$ 0.18	$ 0.14
Diluted net income per common share
Net income, diluted (USD per share)	$ 0.09	$ 0.06	$ 0.18	$ 0.13
Potentially dilutive securities excluded from computation of earnings per share	41,540	2,241,860	37,248	1,146,581