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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
Total
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Common Stock [Member]
Class B Stock [Member]
Beginning balance at Sep. 30, 2018 $ 145,017,000 [1] $ 11,862,000 $ 131,701,000 [1] $ 1,225,000 $ 229,000
Beginning balance, shares at Sep. 30, 2018       12,252,337 2,288,857
Net income [1] 313,000   313,000    
Stock-based compensation 17,000 [1] 17,000      
Ending balance at Dec. 31, 2018 145,347,000 [1] 11,879,000 132,014,000 [1] $ 1,225,000 $ 229,000
Ending balance, shares at Dec. 31, 2018       12,252,337 2,288,857
Beginning balance at Sep. 30, 2018 145,017,000 [1] 11,862,000 131,701,000 [1] $ 1,225,000 $ 229,000
Beginning balance, shares at Sep. 30, 2018       12,252,337 2,288,857
Net income 7,773,000        
Ending balance at Mar. 31, 2019 152,825,000 [1] 11,897,000 139,474,000 [1] $ 1,225,000 $ 229,000
Ending balance, shares at Mar. 31, 2019       12,252,337 2,288,857
Beginning balance at Dec. 31, 2018 145,347,000 [1] 11,879,000 132,014,000 [1] $ 1,225,000 $ 229,000
Beginning balance, shares at Dec. 31, 2018       12,252,337 2,288,857
Net income [1] 7,460,000   7,460,000    
Stock-based compensation 18,000 [1] 18,000      
Ending balance at Mar. 31, 2019 152,825,000 [1] 11,897,000 139,474,000 [1] $ 1,225,000 $ 229,000
Ending balance, shares at Mar. 31, 2019       12,252,337 2,288,857
Beginning balance at Sep. 30, 2019 155,515,000 12,159,000 141,897,000 $ 1,228,000 $ 231,000
Beginning balance, shares at Sep. 30, 2019       12,277,337 2,308,857
Net income 2,489,000   2,489,000    
Stock-based compensation 18,000 18,000      
Ending balance at Dec. 31, 2019 158,022,000 12,177,000 144,386,000 $ 1,228,000 $ 231,000
Ending balance, shares at Dec. 31, 2019       12,277,337 2,308,857
Beginning balance at Sep. 30, 2019 155,515,000 12,159,000 141,897,000 $ 1,228,000 $ 231,000
Beginning balance, shares at Sep. 30, 2019       12,277,337 2,308,857
Net income 1,834,000        
Ending balance at Mar. 31, 2020 157,384,000 12,194,000 143,731,000 $ 1,228,000 $ 231,000
Ending balance, shares at Mar. 31, 2020       12,277,337 2,308,857
Beginning balance at Dec. 31, 2019 158,022,000 12,177,000 144,386,000 $ 1,228,000 $ 231,000
Beginning balance, shares at Dec. 31, 2019       12,277,337 2,308,857
Net income (655,000)   (655,000)    
Stock-based compensation 17,000 17,000      
Ending balance at Mar. 31, 2020 $ 157,384,000 $ 12,194,000 $ 143,731,000 $ 1,228,000 $ 231,000
Ending balance, shares at Mar. 31, 2020       12,277,337 2,308,857
[1] The balances as of September 30, 2018, December 31, 2018 and March 31, 2019, and the amounts for the quarter and six months ended March 31, 2019, have been adjusted to reflect the change in inventory accounting method, as described in Note 3 to the Condensed Consolidated Financial Statements.