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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
Total
Common Stock [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Class B Stock [Member]
Common Stock [Member]
Beginning balance at Sep. 30, 2020 $ 161,220,000 $ 1,229,000 $ 12,331,000 $ 147,428,000 $ 232,000
Beginning balance, shares at Sep. 30, 2020   12,287,337     2,318,857
Net income (loss) 1,551,000     1,551,000  
Ending balance at Dec. 31, 2020 162,771,000 $ 1,229,000 12,331,000 148,979,000 $ 232,000
Ending balance, shares at Dec. 31, 2020   12,287,337     2,318,857
Beginning balance at Sep. 30, 2020 161,220,000 $ 1,229,000 12,331,000 147,428,000 $ 232,000
Beginning balance, shares at Sep. 30, 2020   12,287,337     2,318,857
Net income (loss) 6,174,000        
Ending balance at Jun. 30, 2021 167,450,000 $ 1,230,000 12,386,000 153,602,000 $ 232,000
Ending balance, shares at Jun. 30, 2021   12,298,337     2,318,857
Beginning balance at Dec. 31, 2020 162,771,000 $ 1,229,000 12,331,000 148,979,000 $ 232,000
Beginning balance, shares at Dec. 31, 2020   12,287,337     2,318,857
Net income (loss) 2,288,000     2,288,000  
Stock options exercised 56,000 $ 1,000 55,000    
Stock options exercised, shares   11,000      
Ending balance at Mar. 31, 2021 165,115,000 $ 1,230,000 12,386,000 151,267,000 $ 232,000
Ending balance, shares at Mar. 31, 2021   12,298,337     2,318,857
Net income (loss) 2,335,000     2,335,000  
Ending balance at Jun. 30, 2021 167,450,000 $ 1,230,000 12,386,000 153,602,000 $ 232,000
Ending balance, shares at Jun. 30, 2021   12,298,337     2,318,857
Beginning balance at Sep. 30, 2021 167,289,000 $ 1,234,000 12,590,000 153,233,000 $ 232,000
Beginning balance, shares at Sep. 30, 2021   12,338,845     2,318,857
Net income (loss) (274,000)     (274,000)  
Ending balance at Dec. 31, 2021 167,015,000 $ 1,234,000 12,590,000 152,959,000 $ 232,000
Ending balance, shares at Dec. 31, 2021   12,338,845     2,318,857
Beginning balance at Sep. 30, 2021 167,289,000 $ 1,234,000 12,590,000 153,233,000 $ 232,000
Beginning balance, shares at Sep. 30, 2021   12,338,845     2,318,857
Net income (loss) (850,000)        
Ending balance at Jun. 30, 2022 166,439,000 $ 1,234,000 12,590,000 152,383,000 $ 232,000
Ending balance, shares at Jun. 30, 2022   12,338,845     2,318,857
Beginning balance at Dec. 31, 2021 167,015,000 $ 1,234,000 12,590,000 152,959,000 $ 232,000
Beginning balance, shares at Dec. 31, 2021   12,338,845     2,318,857
Net income (loss) 439,000     439,000  
Ending balance at Mar. 31, 2022 167,454,000 $ 1,234,000 12,590,000 153,398,000 $ 232,000
Ending balance, shares at Mar. 31, 2022   12,338,845     2,318,857
Net income (loss) (1,015,000)     (1,015,000)  
Ending balance at Jun. 30, 2022 $ 166,439,000 $ 1,234,000 $ 12,590,000 $ 152,383,000 $ 232,000
Ending balance, shares at Jun. 30, 2022   12,338,845     2,318,857