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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, 2011 $ 98,799,000 $ 9,860,000 $ 87,987,000 $ 801,000 $ 151,000
Beginning balance, shares at Sep. 30, 2011       8,009,000 1,509,000
Net income 4,472,000   4,472,000    
Stock-based compensation 189,000 189,000      
Ending balance at Sep. 30, 2012 103,460,000 10,049,000 92,459,000 801,000 151,000
Ending balance, shares at Sep. 30, 2012       8,009,000 1,509,000
Net income 6,725,000   6,725,000    
Stock-based compensation 243,000 243,000      
Ending balance at Sep. 30, 2013 $ 110,428,000 $ 10,292,000 $ 99,184,000 $ 801,000 $ 151,000
Ending balance, shares at Sep. 30, 2013       8,009,000 1,509,000