Note 5 - Stockholders' Equity (Deficit) - Summary of Status of Company's Non-vested Shares (Details) - $ / shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Non-vested options (in shares)	583,458	339,897
Weighted-Average Grant Date Fair Value, Non-vested Balance (in dollars per share)	$ 1.43	$ 0.60
Non-vested options, granted (in shares)	890,750	578,467
Weighted-Average Grant Date Fair Value, Non-vested granted (in dollars per share)	$ 1.48	$ 1.57
Non-vested options, vested (in shares)	(456,174)	(283,741)
Weighted-Average Grant Date Fair Value, vested (in dollars per share)	$ 1.19	$ 0.98
Non-vested options, forfeited (in shares)	(86,316)	(51,165)
Weighted-Average Grant Date Fair Value, forfeited (in dollars per share)	$ 1.21	$ 1.09
Non-vested options (in shares)	931,718	583,458
Weighted-Average Grant Date Fair Value, Non-vested Balance (in dollars per share)	$ 1.57	$ 1.43