Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
IncomeTaxes [Line Items]
Total incomes taxes paid	$ 3,850,000	$ 1,150,000
Unrecognized tax benefits	150,000	150,000
Additional accruals of UTB's	0	0
Additional accruals of interest expense nor penalties	$ 0	$ 0
Effective income tax rate	17.20%	20.50%
Income Taxes Paid	$ 3,850,000	$ 1,150,000
Florida R&D Credits [Member]
IncomeTaxes [Line Items]
R&D tax credits carryforwards	0	0	$ 87,000
R&D Credits	0	87,000	$ 87,000
Federal [Member]
IncomeTaxes [Line Items]
R&D tax credits carryforwards	0	0
R&D Credits	421,000	$ 241,000
Internal Revenue Service (IRS) [Member]
IncomeTaxes [Line Items]
Total incomes taxes paid	2,050,000
Income Taxes Paid	$ 2,050,000