CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	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	20,000,000	20,000,000
Common stock, issued shares	8,445,060	8,445,060
Treasury stock, shares	167,900	167,900