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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
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 |  | 21,336,975 | 21,456,539 |
Unvested shares forfeited |  | 2,257 | 7,500 | 0
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Treasury Stock Value Acquired Cost Method |  | $ 2,367 | $ 590 | $ 3,622
The 2006 Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Available Common Stock Authorized Shares |  | 1,060,191 |  |
Common stock, shares authorized |  | 3,000,000 |  |
Common shares repurchased for tax withholding |  | 7,376 | 6,084 |
The 2006 Equity Incentive Plan [Member] | Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued under share based compensation program |  | 1,803 | 5,670 |
The 2015 Stock Repurchase Program [Member] |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Approved Number of shares to be repurchased |  | 1,500,000 |  |
Treasury Stock Shares Acquired |  | 145,484 | 46,929 |
Average Share Price |  | $ 15.37 | $ 11.07 |
Adjustments For New Accounting Principle Early Adoption [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |
New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets 1 |  | $ 59 |  |
Restricted Stock [Member] | The 2006 Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Recognized compensation expense |  | 538 | $ 522 | 290
Unamortized compensation cost |  | 275 |  |
Fair Value of Restricted Stock Vesting |  | $ 460 | 304 | 353
Weighted Avg Grant Date Fair Value of Unvested Restricted Stock |  | $ 8.62 |  |
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 | $ 275 |  |  |
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 |  | $ 167 | $ 136 | 224
Performance Based Phantom Share Units PPSUs [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 |  | 959 | $ 808 |
Performance Cash Units [Member] | The 2006 Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Recognized compensation expense |  | 331 |  |
Stock Option [Member] | The 2006 Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Recognized compensation expense |  | 23 | 70 | $ (45)
Intrinsic Value |  | $ 306 | $ 286 |

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