Consolidated Balance Sheets (Parentheticals) - $ / shares	Sep. 30, 2021	Sep. 30, 2020
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, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	36,403,833	33,561,544
Common stock, outstanding (in shares)	36,403,833	33,561,544