Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Jun. 30, 2020	Sep. 30, 2019
Accounts receivable, allowance for doubtful accounts	$ 250,000	$ 150,000
Inventories, allowance for excess and obsolete inventory	$ 3,400,000	$ 1,275,000
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)	11,294,839	10,861,950
Common stock, shares outstanding (in shares)	11,294,839	10,361,292
Treasury stock, shares (in shares)	0	500,658