Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Current:
Federal tax expense	$ 220	$ 668	$ 0
State tax expense	189	351	121
Deferred:
Federal tax (benefit)	(487)	(685)	0
State tax expense (benefit)	(99)	3	56
Income tax (benefit) expense	$ (177)	$ 337	$ 177

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