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Income Taxes - Provision for Income Tax Expense (Benefit) (Detail) - USD ($)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Current:    
Federal $ 4,718,000 $ 4,151,000
State 335,000 279,000
Total current 5,053,000 4,430,000
Deferred:    
Federal 609,000 (328,000)
State 510,000 8,000
Total deferred 1,119,000 (320,000)
Income tax expense $ 6,172,000 $ 4,110,000