Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011
Dilutive effect of the Company's stock options
Net Income	$ 1,197	$ 2,441	$ 1,724	$ 1,186	$ 2,184	$ 2,064	$ 1,995	$ 1,206	$ 6,548	$ 7,449
Weighted-average common shares outstanding (basic)									5,317	5,271
Weighted-average common shares outstanding (diluted)									5,380	5,324
Net income per share - basic	$ 0.22	$ 0.46	$ 0.32	$ 0.22	$ 0.41	$ 0.39	$ 0.38	$ 0.23	$ 1.23	$ 1.41
Net income per share - diluted	$ 0.22	$ 0.46	$ 0.32	$ 0.22	$ 0.41	$ 0.39	$ 0.38	$ 0.23	$ 1.22	$ 1.40
Stock options [Member]
Dilutive effect of the Company's stock options
Weighted-average common shares outstanding (basic)									15	38
Restricted shares [Member]
Dilutive effect of the Company's stock options
Weighted-average common shares outstanding (basic)									6	8
Performance shares [Member]
Dilutive effect of the Company's stock options
Weighted-average common shares outstanding (basic)									42	7