Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss, Current	$ 181	$ 181
Preferred stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, $0.00001 par value; 100,000,000 shares authorized; 36,984,295 and 36,611,240 shares issued and outstanding, respectively (in dollars per share)	$ 0.00001	$ 0.00001
Common Stock, Shares Authorized (in shares)	100,000,000	100,000,000
Common Stock, Shares, Outstanding (in shares)	37,181,071	36,611,240
Common Stock, Shares, Issued (in shares)	37,181,071	36,611,240