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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 40 $ 42
Common stock, par value (in dollars per share) $ 0.50 $ 0.50
Common stock, authorized shares (in shares) 20,000,000 20,000,000
Common stock, issued shares (in shares) 8,445,060 8,445,060
Treasury stock, shares (in shares) 167,900 167,900