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Income Taxes - Unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Income Taxes    
Balance, beginning of year $ 323 $ 502
Additions for tax positions of current year 11 22
Additions for tax positions of prior years (8) (201)
Reduction for lapse of the applicable statute of limitations (13)  
Accrued penalties and interest 22  
Balance, end of period $ 335 $ 323