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Consolidated Statements of Shareholders' Equity (Unaudited) - 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
Net income       6,878,000 6,878,000
Balance (in shares) at Dec. 31, 2021 1,805,053 (424,307)      
Balance at Dec. 31, 2021 $ 18,000 $ (4,000) 1,755,000 259,750,000 261,519,000
Net income       6,878,000 6,878,000
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
Net income         (20,935,000)
Balance (in shares) at Mar. 31, 2022 1,805,053 (424,307)      
Balance at Mar. 31, 2022 $ 18,000 $ (4,000) 1,755,000 231,937,000 233,706,000
Net income         (20,935,000)
Balance (in shares) at Dec. 31, 2021 1,805,053 (424,307)      
Balance at Dec. 31, 2021 $ 18,000 $ (4,000) 1,755,000 259,750,000 261,519,000
Net income       (27,813,000) (27,813,000)
Balance (in shares) at Mar. 31, 2022 1,805,053 (424,307)      
Balance at Mar. 31, 2022 $ 18,000 $ (4,000) 1,755,000 231,937,000 233,706,000
Net income       (27,813,000) (27,813,000)
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       17,827,000 17,827,000
Balance (in shares) at Dec. 31, 2022 1,805,053 (428,027)      
Balance at Dec. 31, 2022 $ 18,000 $ (4,000) 1,755,000 195,075,000 196,844,000
Net income       17,827,000 17,827,000
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         27,260,000
Balance (in shares) at Mar. 31, 2023 1,805,053 (428,027)      
Balance at Mar. 31, 2023 $ 18,000 $ (4,000) 1,755,000 204,508,000 206,277,000
Net income         27,260,000
Balance (in shares) at Dec. 31, 2022 1,805,053 (428,027)      
Balance at Dec. 31, 2022 $ 18,000 $ (4,000) 1,755,000 195,075,000 196,844,000
Net income       9,433,000 9,433,000
Balance (in shares) at Mar. 31, 2023 1,805,053 (428,027)      
Balance at Mar. 31, 2023 $ 18,000 $ (4,000) $ 1,755,000 204,508,000 206,277,000
Net income       $ 9,433,000 $ 9,433,000