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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
Jun. 30, 2017
Sep. 30, 2016
Marketable securities, cost $ 87,273,000 $ 86,203,000
Accounts receivable, allowance for doubtful accounts $ 186,000 $ 195,000
Preferred stock, par value $ 0.10 $ 0.10
Preferred stock, shares authorized 300,000 300,000
Preferred stock, shares issued 0 0
Common Stock [Member]    
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 12,137,829 12,111,079
Common stock, shares outstanding 12,137,829 12,111,079
Class B Stock [Member]    
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 6,000,000 6,000,000
Common stock, shares issued 2,263,857 2,263,857
Common stock, shares outstanding 2,263,857 2,263,857