Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Income continuing operations		$ 1,331	$ 2,226	$ 3,688	$ 5,357
(Loss) income from discontinued operations, after income taxes		0	(89)	0	3,230
Net income		$ 1,331	$ 2,137	$ 3,688	$ 8,587
Denominator:
Denominator for basic net income per common share — weighted average shares outstanding		26,477,000	25,820,000	26,324,000	25,574,000
Effect of dilutive securities:
Stock options and restricted stock units		775,000	178,000	810,000	542,000
Denominator for diluted net income per common share — adjusted weighted average shares		27,252,000	25,998,000	27,134,000	26,116,000
Basic net income per common share:
Continuing operations, basic (USD per share)		$ 0.05	$ 0.09	$ 0.14	$ 0.21
Discontinued operations, basic (USD per share)		0.00	0.00	0.00	0.13
Net income, basic (USD per share)	[1],[2]	0.05	0.08	0.14	0.34
Diluted net income per common share
Continuing operations, diluted (USD per share)		0.05	0.09	0.14	0.21
Discontinued operations, diluted (USD per share)		0.00	0.00	0.00	0.12
Net income, diluted (USD per share)	[1],[2]	$ 0.05	$ 0.08	$ 0.14	$ 0.33
Potentially dilutive securities excluded from computation of earnings per share		730,400	2,735,177	1,077,150	1,495,104

[1] Earnings per share presented are calculated by line item and may not add due to the use of rounded amounts.

[2] Earnings per share presented are calculated by line item and may not add due to the use of rounded amounts.