Consolidated Balance Sheets (Parentheticals) - USD ($)	Sep. 30, 2019	Sep. 30, 2018
Accounts receivable, allowance for doubtful accounts	$ 150,000	$ 150,000
Inventories, allowance for excess and obsolete inventory	$ 1,275,000	$ 815,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	10,861,950	10,806,803
Common stock, shares outstanding (in shares)	10,361,292	10,306,145
Treasury stock, shares (in shares)	500,658	500,658