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Consolidated Statement of Shareholders' Equity - USD ($)
Total
Capital in Excess of Par Value [Member]
 [1]
Retained Earnings [Member]
Common Stock [Member]
Class B Stock [Member]
Beginning balance at Sep. 30, 2014 $ 114,175,000 $ 10,090,000 $ 102,657,000 $ 1,202,000 [1] $ 226,000 [1]
Beginning balance, shares at Sep. 30, 2014 [1]       12,015,079 2,263,857
Net income (1,819,000)   (1,819,000)    
Stock-based compensation 253,000 253,000      
Stock options exercised 136,000 133,000   $ 3,000 [1]  
Stock options exercised, shares [1]       28,125  
Ending balance at Sep. 30, 2015 112,745,000 10,476,000 100,838,000 $ 1,205,000 [1] $ 226,000 [1]
Ending balance, shares at Sep. 30, 2015 [1]       12,043,204 2,263,857
Net income 7,043,000   7,043,000    
Stock-based compensation 37,000 37,000      
Stock options exercised 380,000 374,000   $ 6,000 [1]  
Stock options exercised, shares [1]       67,875  
Ending balance at Sep. 30, 2016 $ 120,205,000 $ 10,887,000 $ 107,881,000 $ 1,211,000 [1] $ 226,000 [1]
Ending balance, shares at Sep. 30, 2016 [1]       12,111,079 2,263,857
[1] Adjusted for three-for-two stock split