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Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Comprehensive Income (Loss)    
Unrealized Loss for Other Postretirement Obligations $ (264) $ (326)
Tax Effect 55 69
Net Unrealized Loss for Other Postretirement Obligations (209) (257)
Unrealized Loss on Available-for-Sale Securities, net (2,669) (4,890)
Tax Effect 561 1,024
Net Unrealized Loss on Available-for-Sale Securities (2,108) (3,866)
Total Comprehensive Loss $ (2,317) $ (4,123)