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Summary of Significant Accounting Policies (Net Income Per Common Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]      
Net income $ 19,383 $ 10,366 $ 8,411
Denominator for basic net income per common share — weighted average shares outstanding 35,031,000 32,111,000 28,849,000
Effect of dilutive securities:      
Stock options and restricted stock units 964,000 1,283,000 697,000
Denominator for diluted net income per common share — adjusted weighted average shares 35,995,000 33,394,000 29,546,000
Net income per common share:      
Basic $ 0.55 $ 0.32 $ 0.29
Diluted net income per common share:      
Diluted $ 0.54 $ 0.31 $ 0.28
Antidilutive securities excluded from computation of earnings per share 647,181 1,122,121 2,068,004