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Consolidated Statements of Shareholders' Equity - USD ($)
Common Stock [Member]
Treasury Stock, Common [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Sep. 30, 2022 1,805,053 (428,027)      
Balance at Sep. 30, 2022 $ 18,000 $ (4,000) $ 1,755,000 $ 177,248,000 $ 179,017,000
Net income       21,452,000 21,452,000
Balance (in shares) at Sep. 30, 2023 1,805,053 (428,027)      
Balance at Sep. 30, 2023 $ 18,000 $ (4,000) 1,755,000 198,700,000 200,469,000
Net income       78,113,000 78,113,000
Issuance of treasury stock (in shares)   400      
Issuance of treasury stock     202,000   202,000
Balance (in shares) at Sep. 30, 2024 1,805,053 (427,627)      
Balance at Sep. 30, 2024 $ 18,000 $ (4,000) $ 1,957,000 $ 276,813,000 $ 278,784,000