Accrued Expenses - Accrued Expenses (Detail) - USD ($)	Sep. 30, 2022	Sep. 30, 2021
Payables and Accruals [Abstract]
Payroll and related accruals	$ 1,083,000	$ 1,735,000
Warranty and related accruals	244,000	291,000
Property tax accruals	233,000	223,000
Income tax accruals	0	224,000
Professional fees	243,000	105,000
Other	82,000	67,000
Accrued expenses	$ 1,885,000	$ 2,645,000