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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Marketable securities, cost $ 106,563,000 $ 103,751,000
Accounts receivable, allowance for doubtful accounts $ 278,000 $ 313,000
Preferred stock, par value $ 0.10 $ 0.10
Preferred stock, shares authorized 300,000 300,000
Preferred stock, shares issued 0.10 0.10
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 12,252,337 12,252,337
Common stock, shares outstanding 12,252,337 12,252,337
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 2,288,857 2,288,857
Common stock, shares outstanding 2,288,857 2,288,857