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Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Computed expected income tax expense (benefit)		$ (1,429)	$ 5,080	$ 4,371
State income taxes, net of federal benefit		253	672	804
Deferred taxes on subsidiaries acquired/sold				709
Permanent differences		395	45	85
Change in deferred tax liability rate				(8,832)
Change in valuation allowance		1,273
Tax credits		(945)	(900)	(808)
Other		(40)	(1,153)	553
Total income tax expense (benefit)	$ 692	$ (493)	$ 3,744	$ (3,118)

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