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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:        
Net income $ 2,124 $ 803 $ 5,752 $ 3,758
Denominator:        
Denominator for basic net income (loss) per share - weighted-average outstanding shares (in shares) 12,354 12,036 12,246 12,011
Effect of dilutive securities:        
Stock options and restricted stock (shares) 874 1,041 804 1,037
Denominator for diluted net income (loss) per share - weighted-average outstanding shares (in shares) 13,228 13,077 13,050 13,048
Net income per share - basic (in dollars per share) $ 0.17 $ 0.07 $ 0.47 $ 0.31
Net income per share - diluted (in dollars per share) $ 0.16 $ 0.06 $ 0.44 $ 0.29