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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Stockholders' Equity [Abstract] |  |  |  |
Number of shares authorized to be repurchased | 350,000 |  | 350,000 |
Shares |  |  |  |
Balance September 30, 2012 |  |  | 23,235 |
Purchases |  |  | 73,768 |
Issuances to Directors |  |  | (9,710) |
Balance March 31, 2013 | 87,293 |  | 87,293 |
Cost |  |  |  |
Balance September 30, 2012 |  |  | $ 543 |
Purchases |  |  | 2,810 |
Issuances to Directors |  |  | (221) |
Balance March 31, 2013 | 3,132 |  | 3,132 |
Number of shares repurchased under plan | 163,376 |  | 163,376 |
Remaining number of shares available for repurchase | 186,624 |  | 186,624 |
Stock-based compensation expense | $ 174 | $ 125 | $ 315 | $ 246

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