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Income Taxes - Provision for Income Tax Expense (Benefit) (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Current:    
Federal $ 679,000 $ 261,000
State 31,000 37,000
Total current 710,000 298,000
Deferred:    
Federal 1,768,000 (1,871,000)
State (121,000) (154,000)
Total deferred 1,647,000 (2,025,000)
Income tax expense (benefit) $ 2,357,000 $ (1,727,000)