Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Deferred income tax asset:
Net operating loss carry forwards	$ 5,005	$ 10,786
AMT credit carryforward	185	316
Stock based compensation	140	236
Accrued expenses	1,202	1,303
Other items, net	45	241
Total deferred tax asset	6,577	12,882
Deferred tax liability:
Fixed and intangible assets	(2,440)	(3,243)
Net deferred tax asset	$ 4,137	$ 9,639