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Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Current:      
Federal tax expense $ 668 $ 0 $ 0
State tax expense 351 121 246
Deferred:      
Federal tax (benefit) (685) 0 0
State tax expense (benefit) 3 56 (3)
Income tax expense $ 337 $ 177 $ 243