Income Taxes - Schedule of Reconciliation of Actual Income Taxes to Income Taxes at Expected U.S. Federal Corporate Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	21.00%
Tax expense (benefit) at the federal statutory rate	$ 722	$ (3,146)	$ (784)
Effect of permanent book-tax differences	54	145	272
State tax provision	24	34	31
Valuation allowance for net deferred tax assets	842	3,775	1,682
Uncertain tax items	(276)	(47)	74
Tax rate differential	267	222	150
Other items	293	(239)	5
Total provision	$ 1,926	$ 744	$ 1,430