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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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- Definition

The amount before allocation of valuation allowances of deferred asset (liability) attributable to taxable temporary differences not separately disclosed.

+ References

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- Definition

Represents the amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards and the amount of future tax deductions arising from all unused tax credit carryforwards.

+ References

No definition available.

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- Definition

Represents the amount of deferred tax liability attributable to taxable temporary differences from fixed and intangible assets.

+ References

No definition available.

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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