Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 4,000	$ 4,000
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	4,324,140	4,324,140
Common stock, shares outstanding	2,579,680	2,579,684
Treasury stock, shares	1,744,460	1,744,456