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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Taxes [Line Items]
Total incomes taxes paid	$ 2,775,000	$ 1,918,000
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	15.60%	30.90%
R&D tax credits carryforwards	$ 87,000	$ 155,000
Net deferred and other income tax liabilities	(2,358,000)	(1,601,000)
Florida R&D Credits [Member]
Income Taxes [Line Items]
R&D tax credits carryforwards	87,000	155,000
R&D Credits	25,000
Net usage of R&D tax credits carryforwards	$ 93,000
Tax Credit Carryforward, Expiration Date	Sep. 30, 2022
Federal [Member]
Income Taxes [Line Items]
R&D tax credits carryforwards	$ 0	$ 0
R&D Credits	$ 249,000

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