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Income Taxes - Provision for Income Tax Expense (Detail) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Current:    
Federal $ 1,441,000 $ 2,381,000
State 127,000 50,000
Total current 1,568,000 2,431,000
Deferred:    
Federal 631,000 1,238,000
State 126,000 91,000
Total deferred 757,000 1,329,000
Income tax expense $ 2,325,000 $ 3,760,000