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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2013
Sep. 30, 2012
Marketable securities, cost $ 79,247,000 $ 80,568,000
Account receivable, allowance for doubtful accounts $ 263,000 $ 368,000
Preferred stock, par value $ 0.10 $ 0.10
Preferred stock, shares authorized 300,000 300,000
Preferred stock, shares issued      
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 8,008,632 8,008,632
Common stock, shares outstanding 8,008,632 8,008,632
Class B Stock
    
Common stock, par value $ 0.10 $ 0.10
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