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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Deferred income tax asset (liability): |  |
Net operating loss carry forwards and tax credits | $ 10,786 | $ 12,387
AMT credit carryforward | 316 | 231
Stock based compensation | 236 | 172
Fixed and intangible assets | (3,243) | (2,580)
Accrued expenses | 1,303 | 918
Other items, net | 241 | 287
Net deferred tax asset | $ 9,639 | $ 11,415

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