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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 2,004	$ 1,342	$ 2,212	$ 6,024
Denominator:
Denominator for basic net income per common share — weighted average shares outstanding	28,881,000	27,866,000	28,673,000	27,687,000
Effect of dilutive securities:
Stock options and restricted stock units	605,000	572,000	912,000	602,000
Denominator for diluted net income per common share — adjusted weighted average shares	29,486,000	28,438,000	29,585,000	28,289,000
Basic net income per common share:
Net income, basic (USD per share)	$ 0.07	$ 0.05	$ 0.08	$ 0.22
Diluted net income per common share
Net income, diluted (USD per share)	$ 0.07	$ 0.05	$ 0.07	$ 0.21
Potentially dilutive securities excluded from computation of earnings per share	713,980	633,752	592,780	683,752

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