Property and Equipment - Property and Equipment (Detail) - USD ($)	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 26,201,000	$ 24,808,000
Less: Accumulated depreciation and amortization	(20,479,000)	(19,569,000)
Property and equipment, net	5,722,000	5,239,000
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	12,935,000	12,886,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,943,000	$ 8,599,000