Summary of Significant Accounting Policies (Net Income Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Accounting Policies [Abstract]
Net income	$ 10,366	$ 8,411	$ 9,958
Denominator for basic net income per common share — weighted average shares outstanding	32,111,000	28,849,000	27,905,000
Effect of dilutive securities:
Stock options and restricted stock units	1,283,000	697,000	649,000
Denominator for diluted net income per common share — adjusted weighted average shares	33,394,000	29,546,000	28,554,000
Net income per common share:
Basic	$ 0.32	$ 0.29	$ 0.36
Diluted net income per common share:
Diluted	$ 0.31	$ 0.28	$ 0.35
Antidilutive securities excluded from computation of earnings per share	35,160	1,143,411	744,513