Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Deferred income tax assets:
Net operating loss carry forwards	$ 1,554	$ 3,926
AMT credit carryforward	0	183
Stock based compensation	140	140
Accrued expenses	1,698	1,666
Other items, net	258	45
Total deferred tax asset	3,650	5,960
Deferred tax liability:
Equipment and intangible assets	(3,613)	(3,615)
Net deferred tax asset	$ 37	$ 2,345