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Consolidated Balance Sheets (Parenthetical) - USD ($)
Sep. 30, 2015
Sep. 30, 2014
Marketable securities, cost $ 87,123,000 $ 84,997,000
Accounts receivable, allowance for doubtful accounts $ 357,000 $ 244,000
Preferred stock, par value $ 0.1 $ 0.1
Preferred stock, shares authorized 300,000 300,000
Preferred stock, shares issued 0 0
Common Stock [Member]    
Common stock, par value $ 0.1 $ 0.1
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 8,028,882 8,010,132
Common stock, shares outstanding 8,028,882 8,010,132
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