Property and Equipment - Property and Equipment (Detail) - USD ($)	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 31,594,000	$ 29,639,000
Less: Accumulated depreciation and amortization	(23,205,000)	(21,750,000)
Property and equipment, net	8,389,000	7,889,000	[1]
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,323,000	3,323,000
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,462,000	13,350,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14,809,000	$ 12,966,000

[1] The amounts as of September 30, 2018 have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 2 to the Consolidated Financial Statements.