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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, 2021 1,805,053 (424,307)      
Balance at Sep. 30, 2021 $ 18,000 $ (4,000) $ 1,755,000 $ 252,872,000 $ 254,641,000
Receipt of donated treasury stock (in shares)   (3,720)      
Net income (loss)       (75,624,000) (75,624,000)
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 (loss)       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