Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Mar. 31, 2017	Sep. 30, 2016
Accounts receivable, allowance for doubtful accounts	$ 250,000	$ 250,000
Inventories, allowance for excess and obsolete inventory	$ 2,855,445	$ 2,570,868
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)	10,692,902	10,634,893
Common stock, shares outstanding (in shares)	10,192,244	10,134,235
Treasury stock, shares (in shares)	500,658	500,658