Note 8 - Preferred Stock (Details Textual)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022 $ / shares shares	Sep. 30, 2021 $ / shares shares	Oct. 12, 2017 shares
Preferred Stock, Shares Authorized | shares			20,000,000
Preferred Stock, Par or Stated Value Per Share			$ 0.0001
Series A Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized | shares		1,200,000	1,200,000	1,200,000
Preferred Stock, Par or Stated Value Per Share		$ 0.0001	$ 0.0001
Preferred Stock, Liquidation Preference Per Share		$ 35
Preferred Stock, Convertible, Conversion Ratio		10
Preferred Stock, Convertible, Convertibility, Period After Date of Issuance (Day)	540 days