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Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2011
Sep. 30, 2010
Marketable securities, cost $ 76,275,000 $ 70,089,000
Accounts receivable, allowance for doubtful accounts $ 582,000 $ 1,803,000
Preferred stock, par value $ 0.1 $ 0.1
Preferred stock, shares authorized 300,000 300,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.1 $ 0.1
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 8,008,632 8,103,632
Common stock, shares outstanding 8,008,632 8,008,632
Treasury stock, shares   95,000
Class B Stock [Member]
    
Common stock, par value $ 0.1 $ 0.1
Common stock, shares authorized 6,000,000 6,000,000
Common stock, shares issued 1,509,238 1,509,238
Common stock, shares outstanding 1,509,238 1,509,238