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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
IncomeTaxes [Line Items]      
Total incomes taxes paid $ 1,150,000 $ 2,775,000  
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 20.50% 15.70%  
R&D tax credits carryforwards   $ 87,000  
Net usage of R&D tax credits carryforwards   93,000  
Net deferred and other income tax liabilities $ (3,372,000) (2,640,000)  
Tax Credit Carryforward, Expiration Date Sep. 30, 2022    
Florida R&D Credits [Member]      
IncomeTaxes [Line Items]      
R&D tax credits carryforwards     $ 155,000
R&D Credits $ 87,000 25,000  
Federal [Member]      
IncomeTaxes [Line Items]      
R&D tax credits carryforwards 0 0  
R&D Credits $ 241,000 $ 249,000