Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Line Items]
Total incomes taxes paid	$ 1,918,000	$ 1,105,000
Unrecognized tax benefits	150,000	150,000
Additional accruals of UTB's	0	0
Additional accruals of interest expense nor penalties	$ 0	$ 0	$ 0
Effective income tax rate	30.90%	25.10%	48.70%
R&D tax credits carryforwards	$ 155,000	$ 871,000
Net deferred and other income tax liabilities	(1,601,000)	(316,000)
Florida R&D Credits [Member]
Income Taxes [Line Items]
R&D tax credits carryforwards	155,000	224,000
Net usage of R&D tax credits carryforwards	91,000
R&D Credits	$ 22,000
Tax Credit Carryforward, Expiration Date	Sep. 30, 2021
Federal [Member]
Income Taxes [Line Items]
R&D tax credits carryforwards	$ 0	$ 647,000
Net usage of R&D tax credits carryforwards	979,000
R&D Credits	$ 332,000