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Shareholders' Equity - Restricted stock units (Details) - USD ($)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Shareholders' Equity    
Payments for tax withholding for share based compensation   $ 213,000
Restricted stock units    
Shareholders' Equity    
Number of shares per unit of RSU 1  
Payments for tax withholding for share based compensation $ 0 $ 213,000
Restricted stock units | Minimum    
Shareholders' Equity    
Vesting period (in years) 1 year  
Restricted stock units | Maximum    
Shareholders' Equity    
Vesting period (in years) 2 years