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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized |  |  | 100,000,000 | 100,000,000 |
Common stock, shares outstanding |  |  | 21,456,539 | 21,475,741 |
Unvested shares forfeited |  |  | 7,500 | 0 | 0
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Treasury Stock Value Acquired Cost Method |  |  | $ 590 | $ 3,622 | $ 179
Residual Shares Related To Acquisition Returned To Treasury Stock |  |  | 6,859 |  |
The 2006 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Available Common Stock Authorized Shares |  |  |  | 1,056,574 |
Common stock, shares authorized |  |  | 3,000,000 | 3,000,000 |
Common shares repurchased for tax withholding |  |  | 6,084 | 17,677 |
Shares issued under share based compensation program |  |  |  | 199,565 |
The2015StockRepurchaseProgram [Member] |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Treasury Stock Shares Acquired |  |  |  | 482,156 |
Treasury Stock Value Acquired Cost Method |  |  |  | $ 3,500 |
Restricted Stock [Member] | The 2006 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Recognized compensation expense |  |  | $ 522 | 290 | 201
Unamortized compensation cost |  |  | 763 |  |
Fair Value of Restricted Stock Vesting |  |  | $ 304 | 353 | 571
Weighted Avg Grant Date Fair Value of Unvested Restricted Stock |  |  | $ 8.48 |  |
Restricted Stock [Member] | The 2006 Equity Incentive Plan [Member] | Scenario Forecast [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense to be recognized | $ 258 | $ 505 |  |  |
Phantom Share Units PSU's | The 2006 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Recognized compensation expense |  |  | $ 136 | 224 | 243
Stock Option [Member] | The 2006 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Recognized compensation expense |  |  | 70 | (45) | $ 267
Unamortized compensation cost |  |  | 23 |  |
Intrinsic Value |  |  | $ 286 | $ 88 |
Stock Option [Member] | The 2006 Equity Incentive Plan [Member] | Scenario Forecast [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense to be recognized |  | $ 23 |  |  |
Performance Cash Units [Member] | The 2006 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued under share based compensation program |  |  | 420,000 |  |
Recognized compensation expense |  |  | $ 808 |  |

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