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Consolidated Statements of Shareholders' Equity - USD ($)
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Sep. 30, 2019 1,805,053 (424,307)      
Balance at Sep. 30, 2019 $ 18,000 $ (4,000) $ 1,755,000 $ 135,931,000 $ 137,700,000
Net income       4,041,000 4,041,000
Balance (in shares) at Sep. 30, 2020 1,805,053 (424,307)      
Balance at Sep. 30, 2020 $ 18,000 $ (4,000) 1,755,000 139,972,000 141,741,000
Net income       112,900,000 112,900,000
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