CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($)	Dec. 31, 2017	Sep. 30, 2017
Allowance for doubtful accounts (in dollars)	$ 195,000	$ 200,000
Common stock, par value (in dollars per share)	$ 0.0005	$ 0.0005
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	17,929,183	17,893,763
Common stock, shares outstanding	17,119,023	17,083,603
Treasury stock, shares	810,160	810,160