Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net income	$ 2,847	$ 2,928	$ 4,034	$ 2,621
Denominator:
Denominator for basic net income per common share — weighted average shares outstanding	35,015,000	30,900,000	34,785,000	30,129,000
Effect of dilutive securities:
Stock options and restricted stock units	593,000	1,323,000	925,000	1,307,000
Denominator for diluted net income per common share — adjusted weighted average shares	35,608,000	32,223,000	35,710,000	31,436,000
Basic net income per common share:
Net income, basic (USD per share)	$ 0.08	$ 0.09	$ 0.12	$ 0.09
Diluted net income per common share
Net income (loss), diluted (USD per share)	$ 0.08	$ 0.09	$ 0.11	$ 0.08
Potentially dilutive securities excluded from computation of earnings per share	1,129,393	994,096	735,611	864,744