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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 1,040	$ 945	$ 979	$ 324	$ 2,387	$ 776	$ 337	$ (116)	$ 3,288	$ 3,384
Denominator:
Denominator for basic net income per share - weighted-average outstanding shares (in shares)									11,345	9,966
Effect of dilutive securities:
Stock options and restricted stock (in shares)									1,007	1,254
Denominator for diluted net income per share - weighted-average outstanding shares (in shares)									12,352	11,220
Net income (loss) per share - basic (in dollars per share)	$ 0.09	$ 0.08	$ 0.09	$ 0.03	$ 0.23	$ 0.08	$ 0.03	$ (0.01)	$ 0.29	$ 0.34
Net income (loss) per share - diluted (in dollars per share)	$ 0.08	$ 0.08	$ 0.08	$ 0.03	$ 0.20	$ 0.07	$ 0.03	$ (0.01)	$ 0.27	$ 0.30
Income tax benefit	$ (769)	$ (539)	$ (605)	$ (201)	$ 1,604	$ (518)	$ (225)	$ 77	$ (2,114)	$ 938
Increase in earnings per share due to change in deferred tax asset valuation allowance, basic (in dollars per share)											$ 0.09
Increase in earnings per share due to change in deferred tax asset valuation allowance, diluted (in dollars per share											$ 0.08

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