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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, 2016 $ 120,205,000 $ 10,887,000 $ 107,881,000 $ 1,211,000 $ 226,000
Beginning balance, shares at Sep. 30, 2016       12,111,079 2,263,857
Net income 8,418,000   8,418,000    
Stock-based compensation 71,000 71,000      
Stock options exercised 224,000 220,000   $ 4,000  
Stock options exercised, shares       43,750  
Ending balance at Sep. 30, 2017 128,918,000 11,178,000 116,299,000 $ 1,215,000 $ 226,000
Ending balance, shares at Sep. 30, 2017       12,154,829 2,263,857
Net income 12,564,000   12,564,000    
Stock-based compensation 71,000 71,000      
Stock options exercised 626,000 613,000   $ 10,000 $ 3,000
Stock options exercised, shares       97,508 25,000
Ending balance at Sep. 30, 2018 $ 142,179,000 $ 11,862,000 $ 128,863,000 $ 1,225,000 $ 229,000
Ending balance, shares at Sep. 30, 2018       12,252,337 2,288,857